Chainlink Price Feeds, released in 2019, have become the industry-standard oracle solution for decentralized finance (DeFi) applications, providing secure, accurate, and real-time financial market data to blockchain networks. These feeds operate through decentralized oracle networks (DONs) and have supported hundreds of DeFi applications across various blockchains, securing billions in value. The article explores how Chainlink Price Feeds maintain security in the DeFi ecosystem by solving the "oracle problem" using a multilayered decentralization strategy, ensuring data accuracy through aggregation at data source, node, and oracle network levels. The feeds are built on an infrastructure that supports cost-effective data transmission with configurable update parameters, ensuring robust performance even during market volatility and network congestion. Chainlink also employs a multi-tiered defense strategy with transparency, active monitoring, fault tolerance, and disaster recovery to ensure high reliability. The ecosystem is bolstered by a diverse array of node operators from various industries, contributing to its resilience and sustainability. Chainlink's flexibility allows it to natively integrate with any blockchain, avoiding reliance on third-party intermediaries, which enhances its appeal to DeFi developers. As more sponsors join, Chainlink Price Feeds are positioned for sustainable growth, driven by user fees, and are part of a broader suite of data feeds and services that underpin the evolving DeFi landscape.