SushiSwap is a decentralized exchange (DEX) and automated market maker (AMM) built on Ethereum, enabling users to trade, provide liquidity, and earn rewards without intermediaries. Launched in 2020 as a fork of Uniswap, SushiSwap differentiates itself by offering additional DeFi features, including yield farming, staking, and lending. The SUSHI token is used for governance, staking rewards, and fee-sharing within the ecosystem.