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Crypto
Oracle
A service that brings real-world data (prices, weather, sports scores) onto the blockchain for smart contracts to use.
Smart contracts can’t see the outside world by themselves. Oracles solve the "oracle problem" by securely feeding external data on-chain. Without them, DeFi, prediction markets, and insurance protocols wouldn’t work.
It's the messenger that whispers what’s happening outside the blockchain into the smart contract's ear.
Real world: Chainlink is the biggest oracle. A DeFi lending protocol uses Chainlink to know the current price of ETH so it can automatically liquidate loans if the value drops too much.
💡 Oracles are the bridge between the real world and blockchain — they make smart contracts actually smart.