Add https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js using <script>tag in HTML documents.
What is Ajax?
AJAX is a developer’s dream, because you can: Update a web page without reloading the page; Request data from a server – after the page has loaded …(from 3WSchool)
AngularJS is perfect for Single Page Applications (SPAs).(from 3WSchool)