Angular is a framework for building client applications in HTML, CSS and JavaScript (TypeScript). AngularJS was first released in 2010 and became popular quickly, but Angular represents a complete rewrite from 2016 onward. Angular presents design patterns for building maintainable projects with TypeScript, DOM manipulation in the right places, and support for unit and end-to-end testing. It requires Node.js and npm and uses the Angular CLI for speeding up development. Applications are bootstrapped in the app module and main file.