USB (Universal Serial Bus)

USB is a device that can be attached, configured and used, reset, reconfigured and used, share the bandwidth with other devices, detached (while others are in operation) and reattached

Developed by Intel, Microsoft and Philips in 1998.Initial model was USB 1.0.
The latest version is USB 2.0.
Currently supported versions are USB 1.1 and 2.0
The Speed of USB 1.1 is(1.5Mbps or 12 Mbps)
The speed of USB 2.0 is 480Mbps.
USBs are bus powered or self powered.
USBs are hot pluggable (once they are installed, there is no need for rebooting the system).
USBs share their bandwidth.
127 USB devices can be connected to a single USB slot and all the devices shares the bandwidth.
USBs has four wires, one for +5v, one for ground and two for twisted pair cables.
The next version under research is USB3.0, the speed of it may be around 4.8Gbps.

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