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-@ngdoc overview
-@name  Angular Services: Understanding Angular Services
-@description
-
-## What are Angular Services?
-
-Angular services are singletons objects or functions that carry out specific tasks common to web apps.
-Angular has a number of built in services, such as the {@link ng.$http $http service}, which
-provides access to the browser's `XMLHttpRequest` object for making requests to a server. Like other core
-Angular variables and identifiers, the built-in services always start with `$` (such as `$http` mentioned
-above). You can also create your own custom services.
-
-## Using a Service
-
-To use an Angular service, you identify it as a dependency for the component (controller, service,
-filter or directive) that depends on the service.  Angular's dependency injection subsystem takes
-care of the rest. The Angular injector subsystem is in charge of service instantiation, resolution
-of dependencies, and provision of dependencies to components as requested.
-
-Angular injects dependencies using
-["constructor" injection](http://misko.hevery.com/2009/02/19/constructor-injection-vs-setter-injection/).
-The dependency is passed to the component's factory/constructor function. Because JavaScript is a dynamically
-typed language, Angular's dependency injection subsystem cannot use static types to identify service
-dependencies. For this reason a component must, explicitly, define its dependencies by using one of the
-{@link di injection annotation} methods.  For example, by providing a `$inject` property:
-
-        var MyController = function($location) { ... };
-        MyController.$inject = ['$location'];
-        myModule.controller('MyController', MyController);
-
-Or by providing an "inline" injection annotation:
-
-        var myService = function($http) { ... };
-        myModule.factory('myService', ['$http', myService]);
-
-## Defining a Service
-
-Application developers are free to define their own services by registering their name, and **service
-factory function**, in Angular modules.
-
-The purpose of the **service factory function** is to generate the single object, or function, that 
-represents the service to the rest of the application. That object, or function, will then be
-injected into any component (controller, service, filter or directive) that specifies a dependency
-on the service.
-
-Angular factory functions are executed lazily. That is, they are only executed when needed 
-to satisfy a dependency, and are then executed exactly once for each service. Everything that is
-dependent on this service gets a reference to the single instance generated by the service factory.
-
-## Related Topics
-
-* {@link guide/di About Angular Dependency Injection}
-* {@link guide/dev_guide.services.creating_services Creating Angular Services}
-* {@link guide/dev_guide.services.managing_dependencies Managing Service Dependencies}
-* {@link guide/dev_guide.services.testing_services Testing Angular Services}
-
-## Related API
-
-* {@link ./ng Angular Service API}
-* {@link angular.injector Injector API}