Ray Dex AMM exchange is where you can trade one token for another. It is a simple swap interface, just select the two tokens you wish to exchange.
Liquidity comes from Liquidity Providers who stake their tokens in liquidity pools. In exchange, they get LP (Liquidity Provider) tokens, which can also be staked to earn Ray Dex tokens in the "farm".
When you make a token swap (trade) on the exchange you will pay a 0.2% trading fee.