Oracle (Blockchain)
CryptoGlossary term
Definition
A service that provides real-world data to smart contracts on a blockchain, since blockchains cannot natively access information outside their network. Oracles supply data feeds like asset prices, weather conditions, sports scores, or other external information that smart contracts need to function properly. Chainlink is the most widely used oracle network in the DeFi ecosystem.
Related terms
- Smart ContractA self-executing program stored on a blockchain that automatically enforces the terms of an agreement when predetermined conditions are met. Smart contracts eliminate the need for intermediaries by running code that is transparent and cannot be altered once deployed. They are the foundation of DeFi applications, NFTs, and many other blockchain-based services.
- DeFi (Decentralized Finance)A broad category of financial applications and services built on blockchain networks that operate without traditional intermediaries like banks or brokerages. DeFi platforms allow users to lend, borrow, trade, and earn interest on their crypto assets through smart contracts. This ecosystem aims to make financial services more accessible, transparent, and open to anyone with an internet connection.
- BlockchainA distributed digital ledger that records transactions across a network of computers in a way that makes the data nearly impossible to alter retroactively. Each block contains a set of transactions and is cryptographically linked to the previous block, forming a chain. This technology provides transparency, security, and decentralization without requiring a central authority.
- DEX (Decentralized Exchange)A cryptocurrency exchange that operates without a central authority, allowing users to trade directly with one another through smart contracts. Unlike centralized exchanges, DEXs do not hold users' funds and typically do not require identity verification. Popular examples include Uniswap and SushiSwap, which use liquidity pools instead of traditional order books.
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