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  {tip:title=Developer Info}
    [Learn More About Interceptors|Interceptors]

    [Learn About the Parameters Interceptor|Parameters Interceptor]
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Interceptors are a very important part of S2 - they will be invoked before and after your action is executed and the view is rendered, and as such, they are perfect for validation, authentication, open-session-in-view patterns, catching exceptions, setting or altering parameters, hiding complex operations, and more. S2 provides a number of prebuilt stacks with a ranging number of features, but nothing keeps you from defining your own interceptor stack with custom interceptors.

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