Yearn is a financial platform that supports multiple DeFi agreements, and will automatically move positions between protocols to help savers get the highest financial income. The platform aggregates the Compound, dYdX, Aave, and DDEX agreements. When users deposit, the platform will automatically allocate funds to the protocol with the highest revenue. Then yearn will give the user a proof of stake called yToken through which users can withdraw the original deposited token and the corresponding income.