Building Blocks of Angular 4 There are 5 section cover in this blog .. module component template metadata data-binding Module module is a class with ng-module metadata, every angular app has at least one root module encapsulation of different similar functionalities how to declare : @ngmodule({ //decorator declareation :[AppComponent,TaskComponent], //declare Component imports :[BrowserModule,FormsModule,HttpModule], //import Module providers:[], bootstrap:[AppComponent] //providing services to all modules component }) Component Angular 4 components are simply classes that are designated as a component with the help of a component decorator. Every component has a defined template which can communicate with the code defined in the component class. So, let's take a close look at how components are structured. Metadata metadata describes how to process the class ,decorator is used to att