What is view state in Visualforce Page?

Hi Manpreet

You can enable view state of vf page by going through in to setup->manage->user

In user you can go into the system admin profile and checking Development Mode  and Show View State in Development Mode

View state provide you information about the vf page and its controller like what are the methods use in controller and there size

its allow you only 135kb of size so with the help of view state you can maintain your size.

Let me know it help you