---
title: Extending SilverStripe
summary: Understand the ways to modify the built-in functionality through Extensions, Subclassing and Dependency Injection.
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.
icon: code
---

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. 

SilverStripe includes a myriad of extension API's such as *Extension Hooks* and support for programming patterns 
such as *Dependency Injection*. Allowing developers to tailor the framework to their needs without modifying the core 
framework.

[CHILDREN Exclude="How_Tos"]

## How to's

[CHILDREN Folder="How_Tos"]