Different Desktop Environments on Linux
There are a TON of things that happen when you install an OS, but you only see the graphical parts of it, the “graphical user interface” or GUI. Obviously, if that's the main thing your seeing, its fairly important to you on every level.
Linux however, took this whole concept a step further, and established several “flavors” of GUI for your desktop on your Linux OS. Wikipedia describes a desktop environment as just that: A Desktop Environment (DE) commonly refers to a style of graphical user interface (GUI) derived from the desktop metaphor that is seen on most modern personal computers.
This is very important, because if you’ve ever used Linux AT ALL, you know that choice is everything. It’s not about just using “what works” or “whats provided”, its about carving your own path based on precisely what YOU want.