Non-Fungible Tokens

Non-fungible token means each token is unique.

ERC-721

It's a protocal to lanuch a NFT.

NFTs can represent collectibles. (e.g., ownership of a piece of art)

ERC-1155

It resolves the complexity by defining a multi-token model in which the contract holds balances for a variable number of tokens, which can be fungible and non-fungible.