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Chainlink is a crypto oracle network introduced in 2017 to provide oracle solutions to the crypto and Defi world. Oracles are tools designed to provide data feeds from the non-blockchain world to the blockchain and smart contract world(on-chain) The most popular one is Chainlink. This guide looks into how some Defi projects leverage this network to provide services to the Defi market. Aave is one of the top Defi platforms to interact with Chainlink in service provision.