The Ethereum Name Service (ENS) simplifies blockchain interactions by providing human-readable names for Ethereum addresses, akin to how Domain Name Service (DNS) translates IP addresses into domain names, thus allowing users to avoid using confusing long character hashes. ENS supports domain hierarchy, enabling the assignment of subdomains and enhancing accessibility for developers and users. Chainlink, a network of decentralized oracles, has integrated ENS to offer a more streamlined experience, specifically by using ENS as the source of truth for its Data Feeds addresses, allowing developers to utilize readable addresses like `eth-usd.data.eth` instead of complex contract addresses. The process involves constructing node hashes, which are used to resolve contract addresses on-chain, ensuring accurate interactions. ENS's integration with JavaScript libraries like web3.js facilitates easy implementation, and tools such as the eth-ens-namehash npm package automate normalization and hashing. Chainlink's adoption of ENS underscores its commitment to simplifying the developer experience in the blockchain ecosystem by minimizing errors and improving interaction efficiency.