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+@workInProgress
+@ngdoc overview
+@name Developer Guide: About Dependency Injection (DI)
+@description
+
+
+Dependency Injection (DI) is an object-oriented software design pattern that supports the
+decoupling and dependency management of application components.
+
+
+The idea behind DI is to decouple each component from all of the other components that it depends
+on to do its particular job. The way this is done in DI is by moving the responsibility for
+managing dependencies out of each individual component and into a provider component. The provider
+(or injector) component manages the life cycles and dependencies for all of the other components in
+an application.
+
+
+Angular has a built-in dependency management subsystem that helps to make your applications easier
+to develop, understand, and test.
+
+
+For more information on DI in general, see {@link http://en.wikipedia.org/wiki/Dependency_injection
+Dependency Injection} at Wikipedia, and {@link http://martinfowler.com/articles/injection.html
+Inversion of Control} by Martin Fowler, or read about DI in your favorite software design pattern
+book.
+
+
+
+
+## Related Topics
+
+
+* {@link dev_guide.di.understanding_di Understanding DI in Angular}
+* {@link dev_guide.services Angular Services}
+
+
+
+
+## Related API
+
+
+* {@link api/angular.service Service API}
+* {@link api/angular.injector Angular Injector API}