Components - The earlier version of Angular had a focus of Controllers but now has changed the focus to having components over controllers. Components help to build the applications into many modules. This helps in better maintaining the application over a period of time.
Anagular2 Services − are a set of code that can be shared by different components of an application. So for example if you had a data component that picked data from a database, you could have it as a shared service that could be used across multiple applications.
In addition, Angular 2 has better event handling capabilities, powerful templates, and better support for mobile devices.
Modules − This is used to break up the angular2 mobile application into logical pieces of code. Each piece of code or module is designed to perform a single task.
Component − This can be used to bring the modules together.
Templates − This is used to define the views of an Angular JS application.
Metadata − This can be used to add more data to an Angular JS class.
Service − This is used to create components which can be shared across the entire application.
We will discuss all these components in detail in the subsequent chapters of this tutorial.
The official site for Angular is https://angular.io/ The site has all information and documentation about Angular 2.
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