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title: Apex Classes Used in Visualforce Controllers
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---

# Apex Classes Used in Visualforce Controllers

This appendix includes information about the system-supplied Apex classes that can be used when building custom Visualforce controllers and controller extensions.

-   [ApexPages Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_methods_system_apexpages.htm)
-   [Action Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_action.htm)
-   [Cookie Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_sites_cookie.htm)
-   [IdeaStandardController Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_ideastandardcontroller.htm)
-   [IdeaStandardSetController Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_ideastandardsetcontroller.htm)
-   [KnowledgeArticleVersionStandardController Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_knowledgearticleversionstandardcontroller.htm)
-   [Message Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_message.htm)
-   [PageReference Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_system_pagereference.htm)
-   [SelectOption Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_selectoption.htm)
-   [StandardController Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_standardcontroller.htm)
-   [StandardSetController Class](https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_pages_standardsetcontroller.htm)

For more information on custom controllers and extensions, see [Custom Controllers and Controller Extensions](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/controller/pages-controller.md).

For more information on Apex, see the [Apex Developer Guide](https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/).

-   **[Execution Governors and Limits](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-apex-governor-limits.md)**