Angular is an open-source, JavaScript framework that helps you to create large applications in a maintainable manner. It is written in TypeScript and is mostly used to develop single-page applications. It is maintained by Google and was developed in 2009. Angular uses the process of two-way data binding. The model state reflects any changes made in the elements of the UI while the UI state reflects any changes made in the model state. Angular also facilitates proper testing of its applications. It uses the Jasmine testing framework. This framework provides many functionalities to write different kinds of test cases for your applications. Angular makes it easy to build and maintain large applications.