A Universal Serial Bus (USB) is a serial bus standard that defines the cables, connectors, and protocols used in connection, communication, and power supply between computers, peripherals, and other devices. The USB was designed to allow many devices to be connected to a single computer and to provide standardized power. USB ports are typically found on the front and back of computers, and on many other devices such as printers, scanners, and external hard drives.
USB is used to connect a wide variety of devices, including external storage devices, keyboards, mice, printers, scanners, digital cameras, and smartphones. USB also provides power to these devices, so they do not need to be plugged into a separate power outlet.