What is the optional 'EXTERNAL URL' when minting

Product Questions & Discussion
1

I minted a test NFT on Goerli but I can’t see the URL on OpenSea or LooksRare.
Am I not seeing well or is it maybe some metadata?
url

2

You’ll see it on the token’s LooksRare page. Its an external website some marketplaces point to.

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3

I can’t find it on LooksRare, should the URL point to a HTML page containing the artwork or to the artwork itself somewhere on a webserver?