yearn.finance aims to make Decentralized Finance (DeFi) simple by aggregating different lending services such as Aave, Compound, and dYdX. The platform helps yield farmers, or users who actively provide liquidity in order to earn interests from DeFi protocols, to optimize their returns by autonomously moving capital where interests are the highest. Users who provide liquidity to the ecosystem earn yearn.finance’s governance token, YFI, which is used to effect changes to the protocol via on-chain proposals and voting. 


More information here https://yearn.fi/