An oracle is a service or system that provides external, real-world data to a blockchain so that smart contracts can function correctly. Blockchains cannot access outside information on their own, so oracles act as a bridge between the blockchain and the real world.
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An oracle connects blockchain systems with real-world data.
Smart contracts rely on accurate data to execute automatically, such as prices, weather conditions, or sports results. Oracles collect this information from external sources and deliver it to the blockchain in a usable format. There are different types of oracles, including centralized and decentralized ones, each with its own advantages and risks. While oracles make many advanced blockchain applications possible, they also introduce a potential point of failure or manipulation if the data source is unreliable. As a result, the trustworthiness and design of an oracle are critical for the security of the entire system.
Short example:
Suppose a smart contract is designed to pay out insurance if a flight is delayed.
An oracle provides real-time flight data to the blockchain.
If the delay is confirmed, the smart contract automatically triggers the payment.
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