ERC-721 is the Ethereum token standard for non-fungible tokens (NFTs), where each token has a unique identifier and cannot be exchanged on a one-to-one basis with another token. It enables the creation of verifiably unique digital assets such as art, collectibles, and in-game items on the blockchain.
Example
“The Bored Ape Yacht Club collection was built using the ERC-721 standard, making each of the 10,000 ape NFTs a unique on-chain asset with distinct traits and an individual market value.”