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Oracles are the bridge between the blockchain world and the real world, providing external data to smart contracts. They are essential for blockchain applications that require off-chain information. Traditionally, oracles are third-party services that relay data to smart contracts, but they have limitations such as centralization and single points of failure. Decentralized oracle networks are emerging to address these issues, offering enhanced security and reliability. They enable smart contracts to securely access real-world data and automate processes based on that data, revolutionizing various industries.