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Explain root module in angular2.

Root module is an angular module class that describes how the application is assembled and the parts fitted together. The root module is usually named as AppModule.

Every angular application has at least one module, the root module to bootstrap and launch the application. There is only one root module for an angular application.

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What is AngularJS? What are the key features of AngularJS. What are the advantages of using AngularJS? What are the key components of AngularJS Framework? What are the limitations of using AngularJS? Explain about AngularJS Expression. Can we pass parameters to an AngularJS controller? What is bower? What is a component in Angular? What are .ts extension files? How do you communicate between different modules of your application using angularjs? How does interpolation, for example "{{ someModel }}" works? What is $rootScope and how does it relate to $scope? Advantages of components in AngularJS. What is ngBind directive in AngularJS? What is ngIf directive in Angular? Difference between ng-show/ng-hide directives and ngIf in angularjs. Explain directives in Angular. What is the role of selector property of components in AngularJS? Explain Angular architecture. Type of module in Angular 2. Explain root module in angular2. What is an Angular module? What does the npm start do? 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