DODO has a proactive market maker (PMM) algorithm that aims to offer better liquidity, stability, and ways to earn interest than automated market makers (AMMs). You earn interest by providing liquidity into a pool of token pairs that earn interest when people borrow against it. That's a fancy way of saying you send the required amount of Token 1 & Token 2 to a contract (liquidity pool) and when people borrow against it you earn interest from it. You can also pull your tokens out at anytime.