It's like owning the digital code of a piece of art, file, text, etc. Some are taking off being seen as collectibles like Pokémon cards. E.g. nbatopshots sells gif-like cards of NBA players. It has potentional but can be kind of stupid as you just literally view whatever you have and everyone else can view it but you own it. Right now half of nfts seem to be money laundering and such. And I do see it having a worth in the future for virtual reality games.