NFT (non-fungible token) is a non-interchangeable unit of data stored on blockchain that can be sold and traded. Types of NFT data units may be associated with digital files such as photos, videos, and audio, etc. In other words, NFTs are tokens that we can use to represent ownership of unique items, they are secured by the Ethereum blockchain, no one can modify the record of ownership or copy-paste a new NFT into existence.