Secure and reliable price data is crucial for financial applications, particularly in decentralized finance (DeFi) protocols, where it underpins the creation of synthetic tokens, options, futures, and other complex derivatives. Chainlink offers Commodity Data Feeds that integrate secure commodity price data into Solidity smart contracts, enabling developers to launch sophisticated financial products. These feeds leverage a decentralized network of Chainlink oracles, aggregating data from multiple high-quality sources to ensure accuracy and protect against price manipulation. The tutorial details how to employ Chainlink Data Feeds in smart contracts using the Price Consumer template to fetch and utilize real-world commodity prices, such as the XAU/USD feed, on the Ethereum Kovan testnet. This setup facilitates the creation of DeFi derivatives by providing developers with a robust data infrastructure to enhance innovation in the DeFi space.