Question: what is the difference between usb and usb 3?
Answer: USB 2.0 has 4 connector wires while USB 3.0 has a total of 9 connector wires. USB 2.0 offers a transfer rate of 480 Mbps and USB 3.0 offers speed up to 5 Gbit/s, which is 10 times faster. USB 2.0 devices are generally less expensive than USB 3.0 devices.