Chainlink Price Feeds, launched in early 2019, have become a critical component of the decentralized finance (DeFi) ecosystem by providing secure, accurate, and real-time financial market data to smart contracts on various blockchain networks. They address the "oracle problem," which is the challenge of obtaining off-chain data for blockchain applications, by employing a multi-tiered aggregation strategy that ensures high data quality and reliability. These feeds are powered by decentralized oracle networks consisting of experienced node operators from diverse backgrounds, ensuring resilience and security. Chainlink Price Feeds are highly configurable, cost-efficient, and blockchain-agnostic, allowing them to deliver data across multiple chains without dependency issues. This shared cost model aggregates user fees to enhance security and scalability, and their long-term sustainability is supported by widespread adoption. Beyond price feeds, Chainlink is expanding its services to include other types of data feeds, off-chain computation, and cross-chain communication, positioning itself as a comprehensive solution for smart contract developers.