Difference between standardcontroller, controller and extensions in Salesforce

StandardController
Controller
Extensions
contain the same functionality and logic that are used for standard Salesforce pages.
need finer control for how information is accessed for your page, you can write a custom controller or a controller extension using Apex.
extends the functionality of a standard or custom controller.
Can be used with standard objects and custom objects.
Only one Apex class is used.
Multiple Apex classes separated by comma are used.


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