One of the first things people see when looking at Linux is the desktop, or Graphical User Interface (GUI). Unlike most other operating systems such as MS Windows, and MacOS, Linux users have a choice of many different desktop environments, all with their own styles and strengths. You can install another one of these desktop environments after Linux distribution installation, and switch between desktop environments from the login screen. Additionally, you have the ability to change the look and feel of any of the GUIs.
Following are most commonly used Window Managers on Linux:
Please, click on any image below to enlarge. The first set of "Polaroids" is an example of six different basic GUI installations, as labelled. The second set, with various screenshots of customised Gnome graphical user interface done by ordinary users from around the world. The third one, with some examples of KDE desktop environment customisation, also by ordinary users.