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) A non-fungible token (NFT) standard on the Ethereum blockchain, which means each token certifies a unique object. Unlike ERC-20, which is the Ethereum standard for a digital currency token, each of which is the same as the other, ERC-721 is the smart contract standard for a unique entity in digital or physical form.
There Are Many ERC-721 Templates
ERC-721 is the standard format, but there are countless ways of programming an NFT smart contract, and various groups have developed their own templates. Although ERC-721 is limited in scope to NFTs, it is similar to a programming framework, such as for Windows or Android, whereby myriad applications can be developed within its boundaries. See ERC-20
# Token Type