How does upbit work?

So, could you elaborate on how Upbit functions? I'm particularly interested in its underlying mechanisms, including its order matching system, how users interact with the platform, and what measures it takes to ensure security and liquidity. How does Upbit compare to other major cryptocurrency exchanges in terms of performance, user experience, and fee structure? And, given the volatility of the cryptocurrency market, how does Upbit handle risks and ensure stability for its users?