Difference between USB 2.0 and USB 3.0

The speed level "super speed" in USB 3.0 allows data transfer rates upto 5 GBps. Why and How?

Find the answer here.

Also, USB 2.0 can be managed with four pins where as this 3.0 needs five more pins. Yes and the cable needs also to be changed along with this.

Who wants USB 3.0?
Everyone.May not be immediately. But those who dont use anything more than a scanner,printer,keyboard,mouse or even webcam do not have to necessarily use this! Immediate upgradation is useful for those who frequently copy a large amount of data to their USB devices.