USB (Universal Serial Bus) is a standardized serial computer interface that allows peripherals to communicate with a host computer or PA system using a USB cable. It improves plug-and-play capabilities by allowing devices to be connected and disconnected without rebooting the host (also known as hot swapping). USB provides power, from the host, to low-consumption devices such as personal media players, digital cameras, microphones, headsets, or any device with a USB port. Installing individual device drivers is not required. Recently, PA system manufacturers have been including built-in USB ports into their systems for additional media playing options.