Differences between USB 2.0 and USB 3.0

The first is the color difference.

USB 2.0 connector colors are available in white, black, red, and so on.

The USB 3.0 connector color is blue.

[When buying USB sticks, the case says 2.0 or 3.0, but if you are not sure, you can easily tell by looking at the connector color]
Another factor is speed.

USB 2.0 has a data transfer speed of 480 megabits / s (60MB / s).

USB 3.0 data transfer speeds of up to 5 Gbit / s (625MB / S) are 10 times faster than USB 2.0.

[However, these are the maximum data transfer rates of the USB ports calculated in theory. In fact, you can limit the data transfer speeds of the USB flash drives we use.] Another thing is the price.

In general, USB 3.0 is more expensive than USB 2.0.