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DIVAKAR BABU 15DIVAKAR BABU 15 

What is a controller, how many controllers explain?

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Divakar,

Standard Controllers
Contains the same functionality and logic that are used for standard Salesforce pages. Can be used with standard objects and custom objects.
Custom Controllers
Need a finer control for how information is accessed for your page, you can write a custom controller or a controller extension using Apex.
Hope it helps.

Please mark it as best answer if the information is informative.so that question is removed from an unanswered question and appear as a proper solution.

Thanks
Rahul Kumar