What is the Full Form of USB?

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USB full form is Universal Serial Bus. It is essentially designed to establish the connection of a computer to its peripherals like keyboards and mouse and external devices such as mp3, cameras, disk drives, printers, etc. The most widely and commonly used USB device is Universal Serial Bus Drive. Unlike most removable drives, it does not require rebooting after it gets attached. Universal Serial Bus came into life when a group of 7 companies : Compaq, Digital Equipment, IBM, Intel, Microsoft and Northern Telecom decides to form a specifications to merge legacy connectivity such as RS232, Printer port, PS2 port into a single common connector to the Personal Computer.
USB device's implementation has some timing that varies from one vendor to the other. The device driver to work on the PC was also changing from one bug fix to another. Having all these different variants of components working together was a difficult task. The USB Implementor's Forum (USB-IF) then held Compliance workshop (Plugfest) quarterly to ensure that all the USB peripherals can work together. A 70% or more passing grade was given to those who can show enumeration and demonstrate workability.
Version USB1.1 was delivered on 23 September 1998. The 1.1 specifications clarified many timing parameters which were grey-areas in the past. However, no huge "functional" improvements were given. The success of USB was so-so during 1996 through 1997 as product vendors tries to maintain legacy compatibility. For instance, the addition of USB ports does not mean that the PS2, RS232 or the printer ports can be removed from the motherboard. This means that the cost the product is increased to accommodate legacy and still go with USB.
The turning point came with the introduction of the iMac computer. It showed an aesthetic system that consumers liked. More importantly, iMac provides the seeds that promted vendors to manufacture USB peripherals. Microsoft's introduction of the Windows 98 came at the right time as it provided the built-in USB drivers and the stability required to make USB fly. Consumer who were using USB soon came to realize that although USB offers true plug and play feature, the bandwidth was significantly reduced if they were to concurrently run it with many USB devices. The most widely and commonly used USB device is Universal Serial Bus Drive. Unlike most removable drives, it does not require rebooting after it gets attached.

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