What's the difference between a Cover Song and a Remix?

A cover song is a new performance or recording of a previously recorded song by someone other than the original artist.
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The track’s composition is reused, meaning the melody, lyrics, and structure remain largely the same, but the performance is new.
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A cover requires a mechanical license, as it involves the use of the original composition. In most cases, this licensing responsibility is handled by the DSPs — there are only a few exceptions. Find more information here.
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If a cover song substantially modifies the lyrics (translates them into another language or significantly edits them) this will typically require obtaining an additional license from the lyricist or their representative. Websites such as lyricfind.com can assist.

A remix is a new version of a track that alters the original recording, often by changing elements such as tempo, instrumentation, or adding new sounds.
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A remix can be produced by the original artist or by another artist or producer.
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While a remix does reuse the original composition, it is considered an original production if it substantially alters the original recording.
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A remix does not require a mechanical license if it is produced with the authorization of the original rights holder.
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However, if it’s an unofficial remix, it would need proper licensing.