It’s a Linux concept. Basically, imagine you could have a Windows 11 PC with the Windows XP GUI or with the macOS GUI. In Linux, these kinds of different GUIs are just desktop environments, which you can install as you see fit.
Conversely, you can also have an OS without a desktop environment, which is basically what’s used on Linux server PCs.
What does DE mean in this context?
It’s a Linux concept. Basically, imagine you could have a Windows 11 PC with the Windows XP GUI or with the macOS GUI. In Linux, these kinds of different GUIs are just desktop environments, which you can install as you see fit.
Conversely, you can also have an OS without a desktop environment, which is basically what’s used on Linux server PCs.
Desktop environment