Angular is a technology developed by Google to create dynamic web pages in the client browser
Angular is a library (piece of code) written in JavaScript Programming language
Angular enables the development of web applications in an organized manner
Angular provides the ability to develop things faster and less code (more with less)
Angular offers free development tools
There are currently 3 versions for Angular 1, 2 and 4
When the recommended version is 4
...and 5 :)