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title: Extending SilverStripe
summary: Understand the ways to modify the built-in functionality through Extensions, Subclassing and Dependency Injection.
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introduction: SilverStripe is easily extensible to meet custom application requirements. This guide covers the wide range of API's to modify built-in functionality and make your own code easily extensible.
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No two applications are ever going to be the same and SilverStripe is built with this in mind. The core framework
includes common functionality and default behaviors easily complemented with add-ons such as modules, widgets and
themes.
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SilverStripe includes a myriad of extension API's such as *Extension Hooks* and support for programming patterns
such Dependency Injection. Allowing developers to tailor the framework to their needs without modifying the core
framework.
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[CHILDREN Exclude="How_Tos"]
## How to's
[CHILDREN Folder="How_Tos"]