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Chainlink network allows any API with data feedback to provide them directly to smart contracts in exchange for Chainlink tokens. These are called node operators, and allow these data providers to sell their API -based services directly to smart contracts for Link tokens. In the future, it will have countless nodes related to the content outside the blockchain. This content is packaged and encapsulated into an accessible format and interface that can be used for blockchain development and use. With Chainlink, you can call one or more database query data required in a contract, and even allow two different types of companies to communicate separately.