Angular is an open-source, front-end application-design framework and development platform maintained by Google and developed in 2010. It is primarily used to develop efficient and sophisticated SPA's or single-page applications. 

What is Angular? Angular Features, Advantages, and More

What is Angular? Angular is an open-source, front-end JavaScript application-design framework maintained by Google and developed in 2010. Angular is written entirely in TypeScript, a superset of or static typing layer on top of JavaScript. Angular is primarily used to develop SPA's or single-page applications. 

Angular General Information