What is View State?

Since HTTP is a stateless protocol, any web application that needs to maintain state between page requests has to deal with how to handle View State. Visualforce handles it by using a hidden form element. Data in components and controllers are stored in an encrypted and hidden field on your page (see image below) that must be serialized and deserialized every time the Visualforce page is requested. Large view state sizes can quickly cause pages to suffer performance problems. Additionally, the Force.com platform limits your pages to a maximum view state size of 135Kb.

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