The Full form of USB is Universal Serial Bus. Universal Serial Bus (USB) is an industry standard used to define the connectors, cables and communication protocols used in a bus for communication, connection and power supply between computers, laptops and electronic devices. USB was designed to support data transfer and electricity supply between peripheral devices such as keyboard, mouse, printer, portable media players, disk drive etc. In 1994, USB was developed by a group of seven companies named Microsoft, IBM, Compaq, DEC, Intel, NEC, and Nortel. It was developed so that external devices can be connected to PC easily. An USB device can be used across multiple platforms like Windows, Mac, Linux etc. It is very simple to connect USB device with laptops and computers. Just insert the USB device in the USB port of a computer or laptop and it will automatically detect the device and start working. When inserted, it does not ask for rebooting your computer. Universal Serial Bus Drive is the most commonly used USB device. There are three basic sizes of USB connectors; Standard size, Mini size and Micro size.