Sushiswap liquidity pools are placed to pool tokens so that users can use them to make trades in a decentralized way. These pools are created by users and decentralized apps (or dApps, for short) who want to profit from their usage. To pool liquidity, the amounts a user supplies must be equally divided between two tokens: the primary token (sometimes called the quote token, i.e. $IDLE) and the base token (usually ETH or a stable coin).