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Chainlink is a decentralized oracle network that connects smart contracts with real-world data and external APIs, solving the "oracle problem" by enabling blockchains to securely access off-chain information. Its key features include a network of independent node operators who fetch and verify data, cryptographic mechanisms that ensure data integrity, and the LINK token which incentivizes network participants and secures the protocol. What makes Chainlink unique is its widespread adoption across multiple blockchains and its role as an industry standard for reliable data delivery, making it essential infrastructure for DeFi applications, NFT platforms, and other blockchain-based services that depend on accurate external data.