Computer – Useful Resources

Computer Fundamentals – Useful Resources ”; Previous Next The following resources contain additional information on Computer Fundamentals. Please use them to get more in-depth knowledge on this topic. Useful Video Courses Computer Networks Online Course 107 Lectures 8 hours Tutorialspoint More Detail Computer Fundamentals Online Training 47 Lectures 2.5 hours Tutorialspoint More Detail IT Networking Fundamentals (Computer Networking from Basic Level) Most Popular 20 Lectures 4.5 hours Anchal Kamra More Detail Computer Network Basics 20 Lectures 2 hours TELCOMA Global More Detail Computer Hardware, Operating System and Networking Best Seller 43 Lectures 20 hours ILANCHEZHIAN K More Detail Computer Hardware Engineering Training 18 Lectures 10 hours Uplatz More Detail Print Page Previous Next Advertisements ”;

Computer – Discussion

Discuss Computer Fundamentals ”; Previous Next Computer is an advanced electronic device that takes raw data as an input from the user and processes it under the control of a set of instructions (called program), produces a result (output), and saves it for future use. This tutorial explains the foundational concepts of computer hardware, software, operating systems, peripherals, etc. along with how to get the most value and impact from computer technology. Print Page Previous Next Advertisements ”;

Computer – Quick Guide

Computer Fundamentals – Quick Guide ”; Previous Next Computer – Overview Today’s world is an information-rich world and it has become a necessity for everyone to know about computers. A computer is an electronic data processing device, which accepts and stores data input, processes the data input, and generates the output in a required format. The purpose of this tutorial is to introduce you to Computers and its fundamentals. Functionalities of a Computer If we look at it in a very broad sense, any digital computer carries out the following five functions − Step 1 − Takes data as input. Step 2 − Stores the data/instructions in its memory and uses them as required. Step 3 − Processes the data and converts it into useful information. Step 4 − Generates the output. Step 5 − Controls all the above four steps. Advantages of Computers Following are certain advantages of computers. High Speed Computer is a very fast device. It is capable of performing calculation of very large amount of data. The computer has units of speed in microsecond, nanosecond, and even the picosecond. It can perform millions of calculations in a few seconds as compared to man who will spend many months to perform the same task. Accuracy In addition to being very fast, computers are very accurate. The calculations are 100% error free. Computers perform all jobs with 100% accuracy provided that the input is correct. Storage Capability Memory is a very important characteristic of computers. A computer has much more storage capacity than human beings. It can store large amount of data. It can store any type of data such as images, videos, text, audio, etc. Diligence Unlike human beings, a computer is free from monotony, tiredness, and lack of concentration. It can work continuously without any error and boredom. It can perform repeated tasks with the same speed and accuracy. Versatility A computer is a very versatile machine. A computer is very flexible in performing the jobs to be done. This machine can be used to solve the problems related to various fields. At one instance, it may be solving a complex scientific problem and the very next moment it may be playing a card game. Reliability A computer is a reliable machine. Modern electronic components have long lives. Computers are designed to make maintenance easy. Automation Computer is an automatic machine. Automation is the ability to perform a given task automatically. Once the computer receives a program i.e., the program is stored in the computer memory, then the program and instruction can control the program execution without human interaction. Reduction in Paper Work and Cost The use of computers for data processing in an organization leads to reduction in paper work and results in speeding up the process. As data in electronic files can be retrieved as and when required, the problem of maintenance of large number of paper files gets reduced. Though the initial investment for installing a computer is high, it substantially reduces the cost of each of its transaction. Disadvantages of Computers Following are certain disadvantages of computers. No I.Q. A computer is a machine that has no intelligence to perform any task. Each instruction has to be given to the computer. A computer cannot take any decision on its own. Dependency It functions as per the user’s instruction, thus it is fully dependent on humans. Environment The operating environment of the computer should be dust free and suitable. No Feeling Computers have no feelings or emotions. It cannot make judgment based on feeling, taste, experience, and knowledge unlike humans. Computer – Applications In this chapter, we will discuss the application of computers in various fields. Business A computer has high speed of calculation, diligence, accuracy, reliability, or versatility which has made it an integrated part in all business organizations. Computer is used in business organizations for − Payroll calculations Budgeting Sales analysis Financial forecasting Managing employee database Maintenance of stocks, etc. Banking Today, banking is almost totally dependent on computers. Banks provide the following facilities − Online accounting facility, which includes checking current balance, making deposits and overdrafts, checking interest charges, shares, and trustee records. ATM machines which are completely automated are making it even easier for customers to deal with banks. Insurance Insurance companies are keeping all records up-to-date with the help of computers. Insurance companies, finance houses, and stock broking firms are widely using computers for their concerns. Insurance companies are maintaining a database of all clients with information showing − Procedure to continue with policies Starting date of the policies Next due installment of a policy Maturity date Interests due Survival benefits Bonus Education The computer helps in providing a lot of facilities in the education system. The computer provides a tool in the education system known as CBE (Computer Based Education). CBE involves control, delivery, and evaluation of learning. Computer education is rapidly increasing the graph of number of computer students. There are a number of methods in which educational institutions can use a computer to educate the students. It is used to prepare a database about performance of a student and analysis is carried out on this basis. Marketing In marketing, uses of the computer are following − Advertising − With computers, advertising professionals create art and graphics, write and revise copy, and print and disseminate ads with the goal of selling more products. Home Shopping − Home shopping has been made possible through the use of computerized catalogues that provide access to product information and permit direct entry of orders to be filled by the customers. Healthcare Computers have become an important part in hospitals, labs, and dispensaries. They are being used in hospitals to keep the record of patients and medicines. It is also used in scanning and diagnosing different diseases. ECG, EEG, ultrasounds and CT scans, etc. are also done by computerized machines. Following are some major fields of health care in which computers are used. Diagnostic System − Computers

Computer – How to Buy?

How to Buy a Computer? ”; Previous Next In this chapter, we will supply relevant information to help you buy a desktop on component by component basis. As desktops are highly customizable, so it is better to learn about the main parts and then visit the manufacturer or the retailer shop or site, instead of just looking at some specific model directly. Popular desktop brands are Dell, Lenovo, HP and Apple. Always compare the desktops based on their specifications and base price. Monitor Size − It is the diagonal size of the LCD screen. Larger the area, bigger the picture screen. A bigger picture is preferable for movie watching and gaming. It will increase the productivity as well. Resolution − This is the number of pixels on the screen. For example, 24inch display is 1920×1200 (width by length) and 22-inch display is 1680×1050. High resolution provides better picture quality and a nice gaming experience. Inputs − Now-a-days monitors can accept inputs from cable as well apart from the computer. They can also have USB ports. Stand − Some monitors come with adjustable stands while some may not. Recommended − 24 Inch LCD. Operating System Operating System is the main software of the computer as everything will run on it in one form or other. There are primarily three choices: Windows, Linux, Apple OS X. Linux is free, however people generally do not use it for home purpose. Apple OS X works only on Apple desktops. Windows 7 is very popular among desktop users. Most of the computers come pre-equipped with Windows 7 Starter edition. Windows 8 is recently introduced and is available in the market. Windows 7 and Windows 8 come in multiple versions from starter, home basic, home premium, professional, ultimate, and enterprise editions. As the edition version increases, their features list and price increases. Recommended − Windows 7 Home Premium. Optical Drive (CD / DVD / Blu-ray) Optical drive is the drive on a computer, which is responsible for using CD, DVD, and Blu-ray discs. Now-a-days, DVD burners are industry standards. DVD Burner can burn CD, DVD and play them. DVD Burner is cheaper than Blu-ray drives. Blu-ray drives can play HD movies but are costlier component. Recommended − DVD Burner. Memory RAM is considered as Computer Memory as the performance of a computer is directly proportional to its memory and processor. Today”s software and operating system require high memory. Today commonly used RAM is DDR3, which operates at 1066Mhz. As per Windows 7, 1 GB is the minimum RAM required to function properly. Recommended − 4 GB. Hard Drive Hard disk is used for storage purpose. Higher the capacity, more data you can save in it. Now-a-days computers are equipped with 500GB hard drive, which can be extended to 2TB. Most hard drives in desktop operate at the standard performance speed of 7200RPM. Recommended − 500GB. CPU Frequency (GHz) − This determines the speed of the processor. More the speed, better the CPU. Cores − Now-a-days CPUs come with more than one core, which is like having more than one CPU in the computer. Programs which can take advantage of multi-core environment will run faster on such machines. Brand − Intel or AMD. Both are equivalent. Intel is in lead. Cache − Higher the L1, L2 cache, better the CPU performance. Recommended − Intel Core i3-3225 3.30 GHz Processor. Print Page Previous Next Advertisements ”;

Computer – Available Courses

Computer – Available Courses ”; Previous Next Nowadays, various types of courses are provided by educational institutions. Following are some of the common as well as important courses. Course Name Duration (years) Minimum Qualification B.C.A Bachelor of Computer Applications 3 10+2 P.G.D.C.A Post Graduate Diploma in Computer Applications 1 Graduation M.C.A Master of Computer Applications 3 Graduation B.Sc.(CS) Bachelor of Science (Computer Science) 3 10+2 M.Sc.(CS) Master of Science (Computer Science) 2 Graduation B.Tech.(CSE) Bachelor of Technology (Computer Science and Engineering) 4 10+2 B.Tech.(IT) Bachelor of Technology (Information Technology) 4 10+2 M.Tech.(CSE) Master of Technology (Computer Science and Engineering) 2 B.Tech / B.E. M.Tech.(IT) Master of Technology (Information Technology) 2 B.Tech / B.E B.E.(CSE) Bachelor of Engineering (Computer Science and Engineering) 4 10+2 B.E.(IT) Bachelor of Engineering (Information Technology) 4 10+2 Diploma Courses Apart from regular degree courses, computer centers also provide short-term courses (from 3 months to 1 year). Online courses on topics such as Computer Basics, Programming Languages Training, Hardware Training, and Network Certifications are also gaining in popularity. Print Page Previous Next Advertisements ”;

Computer – Data and Information

Computer Fundamentals – Data and Information ”; Previous Next What is Data? Data is a raw material; it’s a collection of facts and figures. Data does not have a significant meaning because of its raw nature. Data may include text, figures, facts, images, numbers, graphs, and symbols and it can be generated from different sources like sensors, surveys, transactions, social media etc. G15, KPL, and Gud are some examples of data. Data needs to be processed to convert into a useful manner which is known as information. For example – Gud is data; after text processing, it converts into Good which is information. Raw material Unstructured information It has no context Processed Data Structured information It has context A proper analysis of data plays an important role in fields like research, science, business, healthcare, agriculture, and technology, driving decision-making and innovation. Characteristics of Data Some characteristics of different types of data are as follows − Type of Data Characteristics Quantitative Data It”s in numerical nature. It can be measured and quantified like height, weight, temperature, etc. This type of data can be analysed using statistical methods. Qualitative / Descriptive Data It is descriptive. It can be explored using colours, textures, opinions or any other related feature. It”s often subjective which requires interpretation. It can be categorical or ordinal. Structured Data It is organized in a predefined structure and usually includes a tabular form like databases, or spreadsheets. Easy to search It can be analysed using standard tools like SQL. Allows performing queries to insert, delete and update. Unstructured Data It lacks a predefined structure. It does not have a pre-defined structure. It may include text documents, social media posts, images, videos, etc. It is difficult to analyse using traditional methods. It processes using advanced techniques like natural language processing (NLP), machine learning, etc. Big Data Data are bigger. It is complex and processes using traditional data processing applications. It has five V”s to identify i.e. volume, velocity, variety, veracity, and value. Metadata It gives information on data about data. It includes data dictionaries, file descriptions, tags, etc. It gives a direction to understand, manage, and improve data search ability and usability. Streaming Data It is continuously generated and transmitted in a real-time environment like sensor data, social media updates, financial market data, etc. It requires real-time data processing. It often uses applications like IoT, real-time analytics, etc. Types of Data Types of Data Quantitative data It”s available in numerical form, like 50 Kg, 165 cm, 15887 etc. Discrete Data Data that take certain values like whole numbers. For example, the number of employees in a department. Continuous Data Data that can take any value within a range. For example, wind speed, and temperature. For example – Over time, certain continuous data, such as the weight of the baby over the year changes or the temperature in the room during the day changes. Qualitative data It”s available in a descriptive form for example name, gender, address, and features of a person. Nominal Data Data that represents categories with no inherent order. For example, colours, and gender. Ordinal Data Data that represents categories with a specific order or ranking. For example, ranking satisfaction levels as “poor,” “average,” or “excellent.” Categorical Data The data which represents categories or labels and is often qualitative is called categorical data. It can include nominal and ordinal data. Numerical Data This type of data includes numbers. It can be either quantitative or qualitative. Time Series Data Data collected over time intervals like stock prices, weather data, and sales figures. Spatial Data Data associated with geographic locations like Google maps, GPS data, and satellite images. What is Information? Information is processed data. It is always useful and used in decision-making. A person who has a lot of information about a particular thing is always considered a knowledgeable person. Hence, a good information base always makes a good knowledge base and a good knowledge base helps to make healthy or fruitful decisions. Characteristics of Information General Characteristics of Information are as follows − It is effective and complete to make decisions. True information is broad in scope. Information relates to the current situation and has an acceptable level of integrity. Information is always compatible with response time. Information is concise and does not contain delicacy. Information is precise and accurate. Information is always relevant. Information can be verifiable. Information contains facts; that can be shared for making fruitful decisions. Information is organised and stored for future reference. Differences Between Data vs Information S.No Data Information 1 Data is a raw material It”s processed data 2 It is meaningless It is meaningful 3 Is not use in decision-making Uses in decision-making 4 Data does not rely on information The information relies on data 5 Data is a collection of facts Information

Computer – Networking

Basics of Computer Networking ”; Previous Next A computer network is a system in which multiple computers are connected to each other to share information and resources. Characteristics of a Computer Network Share resources from one computer to another. Create files and store them in one computer, access those files from the other computer(s) connected over the network. Connect a printer, scanner, or a fax machine to one computer within the network and let other computers of the network use the machines available over the network. Following is the list of hardware”s required to set up a computer network. Network Cables Distributors Routers Internal Network Cards External Network Cards Network Cables Network cables are used to connect computers. The most commonly used cable is Category 5 cable RJ-45. Distributors A computer can be connected to another one via a serial port but if we need to connect many computers to produce a network, this serial connection will not work. The solution is to use a central body to which other computers, printers, scanners, etc. can be connected and then this body will manage or distribute network traffic. Router A router is a type of device which acts as the central point among computers and other devices that are a part of the network. It is equipped with holes called ports. Computers and other devices are connected to a router using network cables. Now-a-days router comes in wireless modes using which computers can be connected without any physical cable. Network Card Network card is a necessary component of a computer without which a computer cannot be connected over a network. It is also known as the network adapter or Network Interface Card (NIC). Most branded computers have network card pre-installed. Network cards are of two types: Internal and External Network Cards. Internal Network Cards Motherboard has a slot for internal network card where it is to be inserted. Internal network cards are of two types in which the first type uses Peripheral Component Interconnect (PCI) connection, while the second type uses Industry Standard Architecture (ISA). Network cables are required to provide network access. External Network Cards External network cards are of two types: Wireless and USB based. Wireless network card needs to be inserted into the motherboard, however no network cable is required to connect to the network. Universal Serial Bus (USB) USB card is easy to use and connects via USB port. Computers automatically detect USB card and can install the drivers required to support the USB network card automatically. Print Page Previous Next Advertisements ”;

Computer – Spread Sheet

Computer Fundamentals – Spread Sheet ”; Previous Next What is Spread Sheet? A spreadsheet is application software developed by Microsoft Corporation, this application is specifically used to organize, analyse, and store data in tabular form. It is typically part of an Microsoft office. It”s composed of rows and columns with each intersection forming a cell where the data can be entered. Some of the most common tasks used to do using spreadsheets are finance analyses, budgeting; data manipulation, statistics analysis and more. Some of the popular spreadsheet software includes Microsoft Excel, Google Sheets, and Apple Numbers. These applications have different computation features such as mathematical functions, charting tools, sorting and filtering capabilities, and support for macros and scripting to automate the task, making them versatile tools for a wide range of tasks. How to start Microsoft Spread Sheet? Step 1 − Click on start button Step 2 − Go to Microsoft Office Step 3 − Select and click on Microsoft Excel (in the below picture Microsoft Excel 2010 version is installed; version may vary users to users system) Step 4 − Finally, you will get Microsoft Excel or Spread sheet like Parts of a Microsoft Spread Sheet A Microsoft spreadsheet typically refers to a file created using Microsoft Excel, a popular spreadsheet program. The main parts of a Microsoft Excel spreadsheet include − Workbook − This is the entire file containing one or more worksheets. When you first open Excel, you”re typically working within a workbook. Worksheet − Also known as a spreadsheet or a sheet, it”s a single tab within a workbook where you can enter and manipulate data. By default, a new workbook comes with one worksheet, but you can add more as needed. Rows − Horizontal lines numbered from 1, 2, 3, and so on, which run across the worksheet from left to right. Each row is identified by a number. Columns − Vertical lines labeled with letters from A to Z, then AA, AB, and so forth. Columns run from top to bottom, and each column is identified by a letter. Cells − The intersection of a row and a column. Each cell has a unique address, which is a combination of the column letter and row number (e.g., A1, B2, C3, etc.). Cell Content − This is the actual data or information contained within a cell. It can be text, numbers, formulas, dates, or other types of data. Formula Bar − Located above the worksheet grid, it displays the contents of the active cell. You can also use it to enter or edit data or formulas in the active cell. Name Box − It displays the address or name of the active cell. You can also use it to navigate to specific cells or ranges. Ribbon − The Ribbon is the strip across the top of the Excel window that contains tabs of various commands and functions organized into groups. Column Headers and Row Headers − The numbered row headers on the left side of the worksheet and the lettered column headers at the top indicate row and column positions, respectively. Worksheet Tabs − Located at the bottom of the Excel window, these tabs allow you to switch between different worksheets within the same workbook. These are the fundamental parts of a Microsoft Excel spreadsheet, providing the structure and functionality for organizing and analyzing data. Popular Spread Sheet One of the most popular spreadsheet software is Microsoft Excel. Excel is widely used for various purposes such as data analysis, financial modeling, budgeting, forecasting, and more. It offers a wide range of features including formulas, functions, charts, pivot tables, and macros, making it a versatile tool for both personal and professional use. Additionally, Google Sheets is another popular option, especially for collaboration and cloud-based storage. It offers many similar features to Excel and allows multiple users to work on a spreadsheet simultaneously. Other notable spreadsheet software includes Apple Numbers, LibreOffice Calc, and Apache OpenOffice Calc, although they may not be as widely used as Excel and Google Sheets. Features of Spread Sheet Spreadsheets are powerful tools used for organizing, analyzing, and presenting data in tabular form. Followings are the key features − Advantages of Spread Sheet Spreadsheets, like Microsoft Excel or Google Sheets, offer numerous advantages across various fields due to their versatility and ease of use. Some of the key advantages include − Organized Data Management − Spreadsheets provide a structured way to organize and store data, making it easy to input, manipulate, and analyze information. Users can create tables, sort data, apply filters, and perform calculations effortlessly. Calculation and Analysis − Spreadsheets are powerful tools for performing various calculations and analyses. They offer a wide range of built-in functions and formulas, allowing users to perform mathematical operations, statistical analysis, financial calculations, and more. Data Visualization − Spreadsheets allow users to create visual representations of data through charts, graphs, and diagrams. These visualizations help users understand complex data sets more easily and communicate insights effectively. Customization − Spreadsheets can be customized to suit specific needs and preferences. Users can adjust formatting, create custom formulas, and design layouts to tailor the spreadsheet to their requirements. Collaboration − Most modern spreadsheet software offers collaboration features that allow multiple users to work on the same spreadsheet simultaneously. This facilitates teamwork and enables real-time collaboration, with features such as commenting, revision history tracking, and shared access controls. Accessibility − Spreadsheets can be accessed from various devices and platforms, including desktop computers, laptops, tablets, and smartphones. Additionally, cloud-based spreadsheet solutions enable users to access their data from anywhere with an internet connection, promoting flexibility and mobility. Integration − Spreadsheets can integrate with other software and tools,

Computer – Keyboard Shortcut Keys

Computer Fundamentals – Keyboard Shortcut Keys ”; Previous Next Before going to have a look at keyboard shortcuts, let”s study some basic working principles of the keyboard and its common types. Keyboards are standard input devices used to enter data or inputs into a computer to process. There are several types of keyboards, each designed for different purposes and preferences. Here are some common types − Standard Keyboards − This is the type of keyboard that you find on your desktop computer. They”re equipped with a QWERTY layout of keys, which are named after the 6 letters at the upper end of the keyboard. Additional keys such as function keys, numeric keypads and navigation keys may be included in the standard keyboard. Laptop Keyboards − The laptop keyboard is small and integrates with the machine. They”re usually similar to the standard keyboard layout but may have smaller keys or missing some key combinations such as numeric keypads to save space. Mechanical Keyboards − Each key on mechanical keyboards has a mechanical switch. Their durable and precise typing experience is complemented by tactile feedback. Mechanical keyboards use Cherry MX, Razer, or Gateron switches with varied actuation pressures and feedback. Membrane Keyboards − A membrane keyboard, also known as a membrane switch keyboard, is made up of tiny layers of flexible material that serve as keys to activate signals for a system or device. Individual keys are mechanical switches that regulate electrical connections, generating signals to issue commands. Each switch regulates an electrical circuit that is inert until pressed. Gaming Keyboards − Gaming keyboards are designed for optimal performance and frequently contain customisable backlighting, macro keys, and anti-ghosting technology to prevent key conflicts during rapid inputs. Ergonomic Keyboards − Ergonomic keyboards are intended to alleviate strain and discomfort during prolonged typing sessions by encouraging a more natural hand position. They might have split or curved layouts to accommodate the natural curvature of the hands and wrists. Wireless Keyboards − Wireless keyboards link to devices using Bluetooth or RF (Radio Frequency) technology, eliminating the need for wires. They provide increased flexibility and convenience by making comfort for their users to type at a distance. Virtual Keyboards − Virtual keyboards include touch interfaces like smartphones and tablets; these are displayed on computer screens with a touch interface. Instead of physical keys, users tap on the screen to interact with them. All of the above mentioned are some most common types of keyboards, each serving different needs and preferences for users. Keyboard Shortcut Keys Shortcut Key Function Ctrl + C (or Ctrl + Insert) To copy the selected content Ctrl + X To cut the selected content Ctrl + V (or Shift + Insert) To paste the selected content Ctrl + Shift + V To paste as plain text Ctrl + Z To undo an action. Ctrl + A To select all items in a document Ctrl + S To save the current document or file. Ctrl + P To print the current document. Ctrl + F Find/search for text within a document or webpage Ctrl + D (or Delete) To delete the selected item and move it to the Recycle Bin. Ctrl + R (or F5) To refresh the active window. Ctrl + Y To redo an action. Ctrl + N To open a new document or window Ctrl + W To close the current window or tab Ctrl + Tab To switch between open tabs or documents Ctrl + Shift + N To create a new folder Alt + Tab To switch between multiple open applications Alt + F4 To close the active item, or exit the active applications Windows logo key + L To lock your PC. Windows logo key + D To display and hide the desktop F2 To rename the selected content F3 To search for a file or folder in File Explorer F4 To show the address bar list in File Explorer F5 To refresh the active window F6 To cycle through the screen elements of a window or computer F10 To activate the menu bar in active applications Alt + A To focus on the first icon in the recommended actions menu Alt + F8 To log on to the sign-in screen and see the password Alt + Esc To cycle the items that have been opened in order of their opening. Alt + underlined letter To perform the command for that letter Alt + Enter To display selected content properties Alt + Spacebar To open the shortcut menu for the active window Alt + Left arrow To Go back Alt + Right arrow To Go forward Alt + Page Up To Move up one screen Alt + Page Down To Move down one screen Ctrl + F4 To close the active document Ctrl + Right arrow To move the cursor to the beginning of the next

Computer – Operating System

Basics of Computer Operating System ”; Previous Next The Operating System is a program with the following features − An operating system is a program that acts as an interface between the software and the computer hardware. It is an integrated set of specialized programs used to manage overall resources and operations of the computer. It is a specialized software that controls and monitors the execution of all other programs that reside in the computer, including application programs and other system software. Objectives of Operating System The objectives of the operating system are − To make the computer system convenient to use in an efficient manner. To hide the details of the hardware resources from the users. To provide users a convenient interface to use the computer system. To act as an intermediary between the hardware and its users, making it easier for the users to access and use other resources. To manage the resources of a computer system. To keep track of who is using which resource, granting resource requests, and mediating conflicting requests from different programs and users. To provide efficient and fair sharing of resources among users and programs. Characteristics of Operating System Here is a list of some of the most prominent characteristic features of Operating Systems − Memory Management − Keeps track of the primary memory, i.e. what part of it is in use by whom, what part is not in use, etc. and allocates the memory when a process or program requests it. Processor Management − Allocates the processor (CPU) to a process and deallocates the processor when it is no longer required. Device Management − Keeps track of all the devices. This is also called I/O controller that decides which process gets the device, when, and for how much time. File Management − Allocates and de-allocates the resources and decides who gets the resources. Security − Prevents unauthorized access to programs and data by means of passwords and other similar techniques. Job Accounting − Keeps track of time and resources used by various jobs and/or users. Control Over System Performance − Records delays between the request for a service and from the system. Interaction with the Operators − Interaction may take place via the console of the computer in the form of instructions. The Operating System acknowledges the same, does the corresponding action, and informs the operation by a display screen. Error-detecting Aids − Production of dumps, traces, error messages, and other debugging and error-detecting methods. Coordination Between Other Software and Users − Coordination and assignment of compilers, interpreters, assemblers, and other software to the various users of the computer systems. Print Page Previous Next Advertisements ”;