Universal Serial Bus, or USB, is an external bus standard that supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices, such as mice, modems, and keyboards. USB also supports Plug-and-Play installation and hotplugging.

Starting in 1996, a few computer manufacturers started including USB support in their new machines. It wasn't until the release of the best-selling iMac in 1998 that USB became widespread. But, while it was expected to completely replace serial and Parallel Ports, they still remain on motherboards.

Now Universal Serial Bus 2.0 has been released, the long awaited overhaul of USB, USB 2.0 features a double transfer rate of data, at 480 MBps.

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