Universal Serial Bus (USB) is an extremely popular serial interface that makes adding peripherals to your computer incredibly easy.
A USB peripheral simply plugs right into the port and works. You don’t need to install a card; you don’t even need to turn off your computer. Because USB configuration happens automatically, built-in USB means you don’t have to fiddle with drivers and software when adding most peripherals.
Unfortunately, USB has a serious limitation: It only works at distances of less that 5 meters (16.4 feet). USB extenders enable you to overcome this distance limitation and place USB devices such as printers and scanners where you need them.
