Let's discuss why to use AngularJS and what is the benefit or value addition that our application can get by using AngularJS:

• AngularJS provides two-way binding: Many client-side MVC frameworks provide only one-way binding. This means that other MVC frameworks will update HTML with the model from the server, and when the user changes the model on the page, the frameworks will not update the model according to the changes made. A developer has to write code to update the model according to the user action. However, AngularJS facilitates two-way binding and has made the life of developers easier by updating the model as per the user's actions on it.
• AngularJS utilizes declarative views: This means that the functionalities will be communicated as declarative directions in HTML to render the models and interact with the DOM to change the page state based on changes in the model. This extensively reduces the code by about 50% to 75% for this purpose and makes the life of developers easier.
• AngularJS supports the directive concept: This is like writing a domain-specific language for the web application. Directives will extend the functionality of HTML and render them dynamically according to the changes in the application rather than just displaying the HTML page.
• AngularJS is highly testable: As said earlier, one of the main mottos of the development of Angular is to introduce a testable client-side MVC framework. AngularJS is highly testable, and in fact, the Angular team has introduced two frameworks: Karma and Protractor, to write end-to-end unit testing to ensure the stability of the code and to enable the refactoring of the code confidently.