Modules, AngularJS

Question:What are Modules in AngularJS? 
AnswerAngularJS modules are containers just like namespace in C#. They divide an angular app into small, reusable and functional components which can be integrated with other angular app. Each module is identified by a unique name and can be dependent on other modules. In AngularJS, every web page (view) can have a single module assigned to it via ng-app directive.

Creating an AngularJS module <script type="text/javascript">
//defining module 
angular.module('myApp', []); 
//OR defining module which has dependency on other modules 
angular.module('myApp', ['dependentModule1', 'dependentModule2']); 
</script>
Using an AngularJS module into your app

You can bootstrap your app by using your AngularJS module as given below:<html ng-app="myApp"> 
<head> ... </head>
<body> ... </body>
</html>

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Question:What components can be defined within AngularJS modules? 
AnswerYou can define following components with in your angular module:
Directive
Filter
Controller
Factory
Service
Provider
Value
Config settings and Routes

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Question:What is core module in AngularJS? 
Answerng is the core module in angular. This module is loaded by default when an angular app is started. This module provides the essential components for your angular app like directives, services/factories, filters, global APIs and testing components.

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Question:How angular modules load the dependencies? 
AnswerAn angular module use configuration and run blocks to inject dependencies (like providers, services and constants) which get applied to the angular app during the bootstrap process.

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Question:When dependent modules of a module are loaded? 
AnswerA module might have dependencies on other modules. The dependent modules are loaded by angular before the requiring module is loaded.

In other words the configuration blocks of the dependent modules execute before the configuration blocks of the requiring module. The same is true for the run blocks. Each module can only be loaded once, even if multiple other modules require it.

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