What does “don't mention it” mean?

used as a polite answer when sb has thanked you for sth

How is “don't mention it” used?

In The King of Comedy (1982), one line is: “- Thanks, Mr. Pupkin. - Don't mention it.”

The clip at the top of this page is from The King of Comedy (1982).

- Thanks, Mr. Pupkin. - Don't mention it.

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