Why does npm set up a proxy? just set up the mirror source. What's the difference between the two?

Why does npm set up a proxy? just set the mirror source. What"s the difference between the two?

Mar.13,2022
For

proxy, set up a proxy server to forward download requests for you; for mirror source, the mirror site has mirrored (downloaded) all npm packages in advance, and you obtained the packages directly from its server

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