What’s the difference between USB 1.1, 2.0 and 3.0?

The maximum data transfer rate and power supply capacity are different.

  USB 1.1: 12 MB / s power supply 5 V 100 mA
USB 2.0: 480 MB / s power supply 5 V 500 mA
USB 3.0: 4.8 GB / s power supply 5 V 900 mA
As mentioned above, the maximum data transfer speed (communication speed) is more than 40 times as of USB 1.1, USB 2.0 is more than 400 times as of USB 1.1.