What are Decorators?

Decorator in Angular 2 is a way of adding annotations and it also adds metadata to accessor, class declaration, parameter, method, and property. In Angular v2 and above everything is a class so decorators are used for differentiating the class usage. Decorators are also known as the Meta Data and are generally prefixed with the symbol @. There are different kinds of decorators available in Angular 2 like @directive, @injectable, @NgModule, etc.

Example:

An Angular built-in decorator component

@Component({
          selector : 'app-root', 
         template : '<p>Simple Angular Component</p>' 
}) 

In the example above class, there is a component decorator if you delete this decorator then the class will become blank.