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A controller is one piece in the Model-View-Controller (MVC) architecture of Visualforce. A controller can be a standard or custom controller and extensions to controllers can written.
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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 …
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1
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with sharing without sharing vs extension?
While going through manuals, it was mentioned Many times that apex classes will not consider security of logged in user but it will run in system mode and we should add custom controller extension to …