Would somebody maybe explain to me what an NFT is? I have good understanding of Bitcoin and Blockchain technology (not deep but sound). But I fail to see how an

Would somebody maybe explain to me what an NFT is? I have good understanding of Bitcoin and Blockchain technology (not deep but sound). But I fail to see how an NFT could be applied to a video clip in a meaningful way. To me it sounds like an NFT is a signature signed with a key of the rightful owner for a digital object like a video clip and that signature is then integrated into a blockchain and associated there with that rightful owner in a verifiable way via that rightful owners public key. Is that it? I mean, I assume no b/c that whole process is meaningless as you may just change one bit in that video file and its no longer associated with that rightful owner - so I suppose I'm missing something here.