The F_USB (Front USB) connector, commonly found on many motherboards, may go by various names depending on the manufacturer. It is a pin header that typically comes in two configurations: a 9-pin connector for USB 1.1/2.0 or a 21-pin connector for USB 3.0. This connector is primarily used to add front-facing USB ports, often integrated into ATX-style cases. Additionally, it can be used to bridge certain PCIe devices that rely on USB functionality within the computer’s case, facilitating communication between the motherboard and the devices.