How does Polkaswap work?

Could you please elaborate on the mechanics of Polkaswap? How does it facilitate the exchange of digital assets across different blockchains? What are the key features that set it apart from other decentralized exchanges, and how does it ensure security and efficiency in its transactions? I'm particularly interested in understanding the role of liquidity pools and how they contribute to the overall trading experience on Polkaswap. Additionally, what are the potential benefits and drawbacks of using Polkaswap for cryptocurrency trading?