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What's your preferred DE?
(lemdro.id)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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A WM is literally just the window manager. It makes windows work and have a border and maximize and stuff but that's it.
A DE gives you a lot of other stuff: a root window that makes up the "desktop", panels & widgets, notification area, an application menu, workspaces, window and workspace switchers, global hotkeys, the concept of a session and stuff related to it (things to run on start, or saving your session between reboots), a unified theme and fonts etc. etc.
There are also programs that fall somewhere between these. For example tiling WM tend to fill the whole screen so they don't care a lot about all the things I mentioned but they can integrate with some other stuff to some extent. Or something like OpenBox which includes a very lightweight desktop, menu and panel so I guess you could call it a DE but it's all contained in one executable.