Decentralized oracles can provide stable data support for blockchain applications by aggregating data from multiple trusted sources, ensuring accuracy and reliability. Unlike centralized oracles, they reduce single-point failure risks and enhance security through consensus mechanisms. By leveraging smart contracts, decentralized oracles deliver real-time, tamper-resistant data, critical for DeFi, supply chain, and gaming applications. However, challenges like data source quality and network latency may impact stability. With proper design, such as incentivizing honest nodes and using redundancy, decentralized oracles can offer robust, scalable data solutions for blockchain ecosystems.