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Questions relating to Apex, the native programming language for the Force.com platform. Use it for general questions on syntax, errors, constructs, and rules of use. Most questions should include a code *excerpt* to help answerers understand specifically what has gone wrong or why you need help.
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What is the Difference Between Controllers and Extensions?
Apex extension is class that extend the the functionality of custom / standard controller
refer to below document for more information:
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages …