what Angular JS routes does ?

The ngRoute module helps your application to become a Single Page Application. If you want to navigate to different pages in your application, but you also want the application to be a SPA (Single Page Application), with no page reloading, you can use the ngRoute module. The ngRoute module routes your application to different pages without reloading the entire application.

Angular js routes enable you to create different URLs for different content in your application.