A DeFi aggregator is a platform that consolidates decentralized finance services, enabling users to access multiple DeFi protocols from a single interface. These platforms simplify the process of finding the best interest rates, yield farming opportunities, and liquidity pools by aggregating data from various DeFi services. DeFi aggregators help users optimize returns by routing transactions to the most advantageous DeFi protocols, saving time and increasing profitability. They are essential tools in the growing decentralized finance ecosystem, providing easier access to complex financial products and improving user experience.