Decorators and Template

Decorators are functions that modify JavaScript classes. Angular defines a number of decorators that attach specific kinds of metadata to classes, so that the system knows what those classes mean and how they should work.

A template combines HTML with Angular markup that can modify HTML elements before they are displayed. 

Template directives provide program logic, and binding markup connects your application data and the DOM. There are two types of data binding:


Ref: angular.io