The reason why IPFS file is been use in the area of NFT is that IPFS file allows users to store and retrieve their content using "fingerprint" that belongs to them. The name of this content is known as "cryptographic hash called (CID).

Wow I love as you professional explained this awesome too and to be sincere with you I am just knowing this which make me glad learning something new to you. Please can I ask what the the difference between CID and Cryptoghapy technology.

Thanks for sharing

wishing you success