What is the difference between Desktop Environment & Window Managers?

what is the difference between Desktop Environment & Window Managers?
please answer my simple question, thanks guys!

Exactly because it's a simple question is why you should do a little more effort to answer this one yourself . Google or the forum search will get you a long way - use it please.
Welcome to the forums btw - be sure to read the forum rules . I'm closing this one.

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