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ENS (Ethereum Name Service) is a distributed, open, and extensible naming system based on the Ethereum blockchain. ENS maps human-readable names like 'alice.eth' to machine-readable identifiers such as Ethereum addresses, other cryptocurrency addresses, content hashes, and metadata. It functions as a decentralized alternative to the traditional DNS, allowing users to replace long, complex wallet addresses with simple, memorable names. Built on a system of smart contracts, ENS supports both the '.eth' top-level domain native to Ethereum and the integration of traditional DNS names. Its architecture is composed of two principal components: the registry, which maintains the record of all domains and their owners, and resolvers, which are responsible for translating names into the corresponding addresses or resources.