SushiSwap is a decentralized cryptocurrency exchange (DEX) built on the Ethereum blockchain. It was created in 2020 as a fork of Uniswap, another popular DEX. SushiSwap aims to offer a more community-driven and decentralized trading platform by allowing users to earn rewards for providing liquidity to the platform.

The platform operates on a similar automated market maker (AMM) model as Uniswap, which means that trades are executed through smart contracts that automatically adjust prices based on supply and demand. However, SushiSwap offers additional features such as yield farming, staking, and governance, which allow users to earn rewards in SUSHI, the platform's native token, by contributing to the platform's liquidity or participating in decision-making processes.

SushiSwap gained popularity in the decentralized finance (DeFi) space due to its innovative features and community-driven approach. However, like other DEXs, it is still subject to market volatility and liquidity risks. Overall, SushiSwap represents an important development in the evolution of decentralized trading platforms and the broader DeFi ecosystem.