Chainlink (LINK) is a decentralized oracle network enabling real-world data connectivity to smart contracts on the Ethereum blockchain. LINK, the network's native cryptocurrency token, is used to pay for oracle services, incentivize accurate data provision, and reward node operators. Founded by Sergey Nazarov and Steve Ellis in 2017, Chainlink enhances the functionality of decentralized applications (DApps) by ensuring secure and reliable data connection. This technology supports various applications such as financial services and supply chain management, strengthening the overall blockchain ecosystem.