Sushiswap is a decentralized exchange (DEX) built on the Ethereum blockchain, which allows users to trade cryptocurrencies without the need for intermediaries. It was created as a fork of the popular Uniswap exchange and offers a variety of features such as yield farming, liquidity pools, and staking. Sushiswap also has a governance token, SUSHI, which allows token holders to vote on proposals and make decisions about the future of the platform. The platform is known for its community-driven approach and its ability to rapidly develop and implement new features.