Decentralized Finance (DeFi) applications and blockchain oracles are growing together, enhancing each other's success and security. The "oracle problem," which involves transferring data from off-chain to on-chain environments, is well-known, but the issue of "data quality" remains less understood. Chainlink's decentralized oracle networks, especially its Data Feeds, address this by emphasizing secure and reliable data transfer, not data creation. Key to this is enabling oracle nodes to connect with premium data providers, ensuring high-quality data delivery, and incorporating decentralization to resist manipulation. Chainlink's architecture employs best practices, including using multiple independent high-quality data sources, transparent performance monitoring, and flexible data sourcing through external adapters. This model helps mitigate risks like market manipulation and flash crashes by relying on data aggregators for comprehensive market coverage. The Chainlink framework allows data providers to operate as traditional APIs or run nodes directly, ensuring robust data delivery while maintaining flexibility and security. By focusing on high-quality data and decentralization, Chainlink aims to enhance the reliability of DeFi applications, supporting their growth while minimizing risks.