If you plug in a USB 3.0 hard drive into a USB 2.0 port, it just functions as a regular USB 2.0 drive.
On paper, USB 3.0 is capable of a transfer speed of 5Gbps (gigabits per second) — roughly 10 times faster than the 480Mbps (megabits per second) speed offered by USB 2.0. Realistically speaking, you may not get this speed owing to a variety of factors, but you can always expect it to be 4 to 5 times faster at the very least.
Therefore, if it takes you about 10 minutes to transfer 5GB of data using USB 2.0, it will take less than 3 minutes to transfer the same data with USB 3.0. If you regularly transfer lots of data between devices, USB 3.0 can save you a lot of time.
Note that you can recognise USB 3.0 ports easily because they are usually blue or have the 'SS' (Super Speed) logo on them.
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