Short for Universal Serial Bus [connect the computer to external memory and peripherals], a USB is an external bus standard that allows the transfer of data at rates up to 12 Mbits per second and USB2 480Mbits per second. A USB port is used to connect peripheral devices, such as mice, printers and keyboards among others, to your computer.USB is an external interface standard, or connector, for communication between a computer and external peripherals and devices. USB is intended to replace existing serial ports, parallel ports, keyboard and monitor connectors and can be used with keyboards, mice, monitors, printers and removable hard drives. USB works at 1.5 and 12 Mbps (Megabits per second) with specific consideration for low cost peripherals. USB 2.0, sometimes referred to as `Hi-Speed USB`, is a much faster enhanced version - working at 480 Mbps.