What is AngularJS?
AngularJS is a JavaScript-based open-source front-end web application framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications.
Why do we use?
AngularJS is a structural framework for dynamic web apps. With AngularJS, designers can use HTML as the template language and it allows for the extension of HTML's syntax to convey the application's components effortlessly. Angular makes much of the code you would otherwise have to write completely redundant.
How Does It Work?
When AngularJS starts your application, it parses and processes this new markup from the template using the compiler. The loaded, transformed and rendered DOM is then called the view. The first kind of new markup are the directives. They apply special behavior to attributes or elements in the HTML.
Why do we learn AngularJS?
AngularJS is supported by several vital features like two-way data binding, dependency injection and so on, and this makes it easier to create interactive web applications. The powerful JavaScript framework is in high demand in the industry and IT giants like IBM, Google and many more, are looking forward to hiring talented developers highly skilled in AngularJs.
There has been a considerable increase in the salary package of web developers with AngularJs skills. So learn the fully featured framework with LearnVern’s AngularJs course and add on to your skills.
Features Of AngularJS:
• AngularJS is a powerful JavaScript-based development framework to create RICH Internet Application(RIA).
• AngularJS provides developers options to write a client-side application (using JavaScript) in a clean MVC(Model View Controller) way.
• An application written in AngularJS is cross-browser compliant. AngularJS automatically handles JavaScript code suitable for each browser.
• AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.
Overall, AngularJS is a framework to build large-scale and high-performance web application while keeping them as easy-to-maintain.
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Author's Bio: 

The AngularJS tutorials Start with the basics of AngularJs like modules, MVC, expressions, scope, etc, and gradually cover advanced topics like services, events, dependency injection, templates, routing, data binding, custom directives, filters and forms, and controls.