That cover is called a dust jacket (sometimes dust cover).
It’s purpose is to protect the actual cover of the book from damage. The artwork goes on the dust jacket because it’s the bit you see.
You don’t need to keep it. The title is usually printed on the spine. If you’re into collecting rare books first editions etc they add considerable value though.
Whenever I read a book with a dust cover I immediately take it off and save it for later. That way, when I’m out and about, I don’t need to take as good care of my book, because when it goes back into my bookshelf, it looks as good as new with the preserved dust cover.
Also it’s a pain in the ass to keep around. It seems to crease and fall off all the time.
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