A controller in a Visualforce page is a set of instructions that specify what happens when a user interacts with the components in that page (like buttons or links). Controllers can be standard (provided by Salesforce and linked to standard or custom objects) or custom (written in Apex). They manage the logic, such as data retrieval, data manipulation, and action handling. A custom controller is entirely written in Apex and gives more flexibility to define custom behavior and logic for the Visualforce page.
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