USB or Universal Serial Bus is the most popular worldwide standard for communicating external devices like mouse, keyboard, digital cameras, etc with PC. A single USB port can connect up to 127 devices. The biggest advantage of USB is that there is no need for the PC to reboot whenever a device is connected or disconnected. Another nice feature of USB is it is plug and play, which means that a USB device will be automatically recognized shortly after being connected to a host. The work on the development of USB standard started in 1994 and the first usable version USB 1.1 was released in 1998 followed by USB 2.0 in 2000 and USB 3.0 in 2008. The USB standard transfers data serially and a maximum speed of 5Gbit/sec has been achieved in USB 3.0. The latest development in USB is Wireless USB.
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