The key use-case right now is for owning cool stuff minted online, usually with an image or GIF, but sometimes with sound, video or text attached to a completely unique token on Ethereum or, in the case of the surging NBA Top Shot, on Flow. So when users buy that cool-digital-thing, whether a sliver of basketball video or brilliant piece of artwork, do they know how the cool-digital-thing is hosted and can they verify it will continue to exist over time?
Source: It’s an NFT Boom. Do You Know Where Your Digital Art Lives? – CoinDesk