What is USB 1.0?
It is basically the first standard definition of USB it supports a low speed rate of 1.5 Mbit/s. It is intended primarily to save cost in low-bandwidth human interface devices (HID) such as keyboards, mice, and joysticks.
What is USB 1.1?
It is the next generation of the USB Devices. It supports full speed rate of 12 Mbit/s. It is very similar to the previous standard except each bit transfer is 8 times faster. All USB hubs support full speed.
What is USB 2.0?
A hi-speed (USB 2.0) rate of 480 Mbit/s was introduced in 2001. All hi-speed devices are capable of falling back to full-speed operation if necessary; they are backward compatible. Connectors are identical to the original USB.
What is USB 3.0?
It boasts a much more higher data transfer bandwidth of SuperSpeed (USB 3.0) rate at 5.0 Gbit/s. The USB 3.0 specification was released by Intel and partners in August 2008. New devices supporting USB 3.0 is expected to be produced by the end of this year. The new connectors will be backward compatible but they will include a new wiring system to allow for full duplex communication.