How does SushiSwap work?

Can you explain in simple terms how SushiSwap operates? I've heard it's a decentralized exchange, but I'm unsure of the exact mechanics behind it. How do users trade tokens on SushiSwap? What role does liquidity play in the process? And what makes it different from other DEXs? I'm particularly interested in understanding how it leverages smart contracts and automated market makers to facilitate transactions. Thanks in advance for your insights!