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The Universal Serial Bus, or USB for short, is a means of connecting peripherals such as mice, keyboards, digital cameras, printers, scanners etc. to a computer. It is designed to be simple to use and has now become a standard on all new computers. USB allows for up to 127 devices to be connected. Once the device drivers have been installed, peripherals can be connected and unplugged at will with no rebooting required! Plugging a device in to the computer makes it instantly usable, almost perfect "plug and play". Low power devices such as mice and keyboards can draw their power directly from the USB port. Devices with high power requirements like printers and cameras need to have their own supply. Each port can supply a maximum of 0.5Amp.
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