The data from the Salesforce objects can be brought into the Visualforce page using variables and expressions. Like other normal programming language, the Visualforce language has expressions, operators and literals, etc. The basic building block of this language is expressions.

The syntax of a Visualforce expression is as below.

{! expression }

Example

Let us use the global variable $user. We can write the following code to get the username, First name and login name.

On previewing the output, we get the following details.

Similarly, we can use many other variables and manipulate them using formula as shown in the code below.

On previewing the output, we get the following details.