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