The Intel(R) ICH9 Family USB Universal Host Controller - 2935 is a driver for a USB (Universal Serial Bus) controller on a computer that uses the Intel ICH9 chipset. The ICH9 chipset is part of Intel's I/O Controller Hub family, and it provides various features for managing system connectivity, including USB ports. The USB controller is responsible for managing the communication between the computer and USB devices like mice, keyboards, printers, and external drives.

In simpler terms, this driver ensures that your operating system correctly communicates with the USB ports on your computer that are controlled by the Intel ICH9 chipset.