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What are the different types of controllers?

What are the different types of controllers?

Controller definition: A visual force controller is a set of instructions that specify what happens when a user interacts with the components specified in associated Visualforce markup, such as when a user clicks a button or a link.

Controllers also provide access to the data that should be displayed in a page, and can modify component behavior.

Standard Controller: A standard controller consists of the same functionality and logic that is used for a standard Salesforce page. For example, if we use the standard accounts controller, clicking a Save button in a Visualforce page result in the same behavior as clicking Save on a standard Account edit page.

Custom Controller: A custom controller is a class written in Apex that implements all of a page logic.

If we use custom controller, we can define new navigation elements or behaviors, but we must also reimplement any functionality that was already provided in a standard controller.

Controller Extensions: A controller extensions is a class written in Apex that adds to or overrides behavior in a standard or custom controller. Extensions allow us to leverage that functionality of another controller while adding our own custom logic.

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