How does Leo works?

Could you please explain to me how Leo operates? I'm curious about the intricacies of its functionality. Could you break down the steps involved in its operation? I'm particularly interested in how it handles transactions and how it ensures security. Additionally, could you elaborate on any unique features or functionalities that Leo offers? I'd appreciate it if you could provide a detailed description of how Leo works in a way that's easy to understand. Thank you in advance for your assistance.