ERC-721
Also known as: Non-Fungible Token Standard, Ethereum NFT Standard, ERC721
A token standard on Ethereum for representing unique, non-fungible assets like NFTs.
ERC-721 is an Ethereum token standard used to define non-fungible tokens (NFTs)—unique digital assets with distinct properties and metadata. Unlike ERC-20 tokens, which are interchangeable, each ERC-721 token has a unique identifier and can represent assets like art, collectibles, game items, or domain names. ERC-721 defines functions such as `ownerOf`, `transferFrom`, and `tokenURI` to facilitate ownership tracking, transfers, and metadata retrieval. Most NFT platforms like OpenSea and Rarible use ERC-721. Its design supports creativity, provenance, and scarcity in the digital world.