This USB 3.0 pin header can be plugged to a free USB 3.0 pin header male of your mainboard in order to expand your system internally by two USB 3.0-A ports. Thus you can connect e.g. an USB memory stick or USBWLAN stick. Since the USB 3.0-A interface is compatible to its forerunners USB 2.0 and USB 1.1, you can still use your existing USB devices.
Based on the mainboard, both USB ports are aligned to the right and left.