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title: Standard Controllers
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# Standard Controllers

A Visualforce controller is a set of instructions that specify what happens when a user interacts with the components specified in associated Visualforce markup, such as when a user clicks a button or link. Controllers also provide access to the data that should be displayed in a page, and can modify component behavior.

The Lightning platform provides a number of standard controllers that contain the same functionality and logic that are used for standard Salesforce pages. For example, if you use the standard Accounts controller, clicking a **Save** button in a Visualforce page results in the same behavior as clicking **Save** on a standard Account edit page.

A standard controller exists for every Salesforce object that can be queried using the Lightning Platform API.

-   **[Associating a Standard Controller with a Visualforce Page](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-associate.md)**  

-   **[Accessing Data with a Standard Controller](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-access-data.md)**  

-   **[Using Standard Controller Actions](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-actions.md)**  

-   **[Validation Rules and Standard Controllers](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-validation-rules.md)**  

-   **[Styling Pages that Use Standard Controllers](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-styling.md)**  

-   **[Checking for Object Accessibility](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages-controller-std-checking-accessibility.md)**  


    If a user has insufficient privileges to view an object, any Visualforce page that uses a controller to render that object is inaccessible. To avoid this error, ensure that your Visualforce components only render if a user has access to the object associated with the controller.