Angular is a web framework that empowers developers to build fast, reliable applications. Maintained by a dedicated team at Google, Angular provides a broad suite of tools, APIs, and libraries to simplify and streamline your development workflow. Angular gives you a solid platform on which to build fast, reliable applications that scale with both the size of your team and the size of your codebase.
If you don’t know about AngularJS first go through the AngularJS tutorials.