PC Master is a remote control system that lets an Android mobile client securely connect to a Windows PC server, offering seamless input simulation (mouse, keyboard, gestures, gyroscope), system controls (lock, sleep, shutdown, restart), and specialized features like presentation and media control. It uses WebSocket and UDP for real-time communication and discovery, supports QR pairing, device authorization, and customizable UI with Material Design 3. With saved devices, preferences, and secure pairing, it provides a reliable, user-friendly way to manage a PC remotely.