Universal Serial Bus (USB) is a serial bus standard to interface devices. USB was designed to allow many peripherals to be connected using a single standardized interface socket and to improve the plug-and-play capabilities. Other convenient features include providing power to low-consumption devices without the need for an external power supply.
Current versions: USB 1.0/1.1 Data rates of 1.5 Mbit/s (Low-Speed) and 12 Mbit/s (Full-Speed)
USB 2.0 Higher maximum speed of 480 Mbit/s (now called Hi-Speed). Backward-compatible with USB 1.0/1.1 devices.
USB 3.0 (TBA) USB 3.0 is targeted at roughly 4.8 Gbit/s (Superspeed). Backwards-compatible with USB 2.0 and USB 1.1