Odos is a decentralized exchange aggregator that optimizes order routing across multiple blockchain protocols, accessing over 700 liquidity sources and thousands of token pairs. It uses a proprietary algorithm for Smart Order Routing (SOR) to find the most efficient paths for swaps, ensuring users get the best rates while maintaining self-custody and security. Odos stands out by allowing atomic multi-token swaps in a single transaction, aiming to save on gas costs and reduce market impact for its users.