The Ethereum Name Service (ENS) is a decentralised naming system built on the Ethereum blockchain, designed to map human-readable names to machine-readable identifiers. It simplifies the user experience by replacing complex Ethereum addresses with easy-to-remember names, supporting address mapping, content hashes, metadata storage, and cross-platform usability. ENS was created by Nick Johnson and Alex Van de Sande under the Ethereum Foundation and launched in May 2017.