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Visualforce relates to questions where the Visualforce language or framework are concerned. This is primarily VF pages, components, PDF rendering, and email templates. This would only cross-over to Lightning where Lightning Out (Lightning for VF) or VF pages using SLDS or being used in LEX. Where a question relates to Apex invoked as part of a VF page, this tag would also be appropriate.
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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/ …