AngularJS is basically used to extend the Hyper Text Markup Language. It will extend HTML with the help of Directive. AngularJS Provide lots of in build directive which make our application easier.
Pavyzdžiui: <div ng-app=""> // Statement will come here </div>
Here in this example ng-app is a in-built angular directive which will basically use to initialize the application of AngularJS.