A desktop environment is a collection of software designed to give functionality and a cerain look and feel to an operating system.linux users have a choice of many different desktop environment,all with their own style and strengths.

 You can install one of these desktop environment after installing your linux distribution and switch between desktop environment from the login screen.you can also choose to install a linux distribution that comes with the desktop environment.for example ,you can get ubuntu in many different flavors.

Desktop Environment