USBd

USBd is a daemon process commonly found on macOS and other Unix-like operating systems that manages USB devices. Its primary function is to provide a standardized way for the operating system and applications to interact with USB hardware. When a USB device is plugged into a computer, USBd is responsible for detecting it, identifying its type, and loading the appropriate drivers. It facilitates communication between the device and the system, allowing for data transfer and control.

The daemon runs in the background and monitors the USB bus for any changes. This includes detecting when devices are connected or disconnected, as well as handling power management for USB ports. USBd plays a crucial role in ensuring that USB devices function correctly and seamlessly, without requiring user intervention for basic operations. It often works in conjunction with other system services and frameworks to provide a comprehensive USB experience. Issues with USBd can sometimes manifest as USB devices not being recognized or functioning intermittently.