What is the difference between bound variable and global variable in Salesforce Apex?

Hi Anurag,

There is no term 'Bound Variable' in salesforce, rather it is BIND variable.

The BIND variable is the variable name TIED with the controller.

Using the standard controller (<apex:page standardController="Contact">) and referencing it as {! Contact.FirstName } would be accepted as solution.

Use global variables to reference general information about the current user and your organization on a page.
Global variables must be referenced using Visualforce expression syntax to be evaluated.

For example:  {!$User.FirstName}.

Hope this helps.

Thanks