Tadpole Finance is a DeFi lending protocol. In more technical terms, it's an algorithmic money market protocol. You could think of it like an open marketplace for money. What distinguishes Tadpole from other DeFi projects is that anyone can register any ERC-20 token with Tadpole into the lending protocol. Once a token is registered on the market, people can send some deposits into the protocol to earn interest or borrow the token by placing certain collateral and paying some interest.