Angular referred to as Angular 2+ is an open source front-end web application platform. The code is written in TypeScript, which compiles to Javascript and displays the result. Angular also include ES6 . First version that was released is Angular 1. Angular 1 is followed by Angular 2, which came in with a lot of changes when compared to Angular 2. Angular does not have the concept of scope and controller. The main building blocks are: - Modules - Components - Templates - Metadata - Binding - Directives - Decorators - Dependency Injections - Services - Observables - Subscribe