The Intel(R) 5 Series/3400 Series Chipset Family USB Enhanced Host Controller - 3B34 is a driver associated with Intel's chipset for managing USB (Universal Serial Bus) functionality on your computer. Specifically, this driver is part of the system that controls the USB ports on a computer that uses an Intel 5 Series or 3400 Series chipset (usually found in Intel's motherboards or laptops). This driver enables communication between the operating system and the USB ports, allowing you to connect various USB devices (such as flash drives, keyboards, mice, printers, etc.) to your computer.

The "Enhanced Host Controller" part refers to USB 2.0 support, which can handle higher data transfer speeds (up to 480 Mbps) compared to older USB controllers. This is part of the chipset's function to allow the operating system to manage the USB bus and devices properly.