What is the use of encapsulation parameter in component portion in angular js 2 : Kindly explain the `encapsulation` parameter in angular js 2. when i add this parameter i have some error message. how can i remove it.

  
     @Component({
          selector: 'app-add',
          templateUrl: './add.component.html',
          styleUrls: ['./add.component.css'],
          encapsulation: ViewEncapsulation.None
        })