What is AngularJS?
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding.
AngularJS is a tool in the Javascript MVC Frameworks category of a tech stack.
Why developers like AngularJS
Quick to develop
Great mvc
Powerful
Restful
Backed by google
Two-way data binding
Javascript
Open source
Dependency injection