SushiSwap is an open-source, decentralized exchange (DEX) on the Ethereum blockchain that was initially launched as a copy (or fork) of another DEX, Uniswap. The SushiSwap exchange uses an automated market maker (AMM) protocol, meaning it doesn’t need an order book in order to operate. Instead, SushiSwap uses liquidity pools and smart contracts to execute trades without a centralized authority. Liquidity pools are tokens stored by other users, who stake their tokens in return for rewards.

https://sushiiswap.net/