USB (Universal Serial Bus) is a plug-and-play hardware interface for peripherals such as the keyboard, mouse, joystick, scanner, printer and modem USB has a maximum bandwidth of 12 Mbits/sec and up to 127 devices can be attached With USB, a new device can be added to your computer without having to add an adapter card It typically is located at the back of the PC and looks like this (sometimes positioned vertically): Sometimes it has the USB symbol next to it, like this