Non-fungible token (NFT): A non-fungible token (NFT) is a special type of token on a blockchain that can be used to prove ownership of an item. NFTs can be thought of as a digital representation of an asset. Unlike other tokens, a non-fungible token cannot be freely used as a means of payment, but serves solely as proof of ownership (e.g. of a work of art or a patent). Artists sell or auction their works via NFT platforms, for example. The previous auction record for digital art was set by the American artist Beeple in mid-March 2021: a digital collage comprising 5,000 small Beeple images was worth the equivalent of around 58 million US dollars to a collector. (Publication date: 15 March 2021)
See https://www.blockchain-insider.de/was-ist-nft-a-1019258/ or