The Synology Virtual USB Hub is a software driver used in Synology NAS (Network-Attached Storage) systems. It enables the use of USB devices (such as printers, external hard drives, scanners, etc.) attached to a Synology NAS from a Windows PC over a network. This virtual USB hub allows a USB device connected to a Synology NAS to appear as though it is directly connected to your Windows computer, enabling you to use the device remotely.