Non-fungible tokens (NFT) contain unique information and cannot be replaced or substituted with other tokens.
NFT in the blockchain functions in such a way that it is impossible to duplicate them, and sometimes it is impossible to transfer from one owner to another without the permission of the creator.
NFTs are particularly popular as art objects that contain either the data itself (images, music, etc.) or a hash of this data. In the second case, the data itself, which is an object of art, is stored outside the blockchain. The creation, trading and exchange of NFT take place on specialized platforms.