What does it mean when a car stereo has a USB port on the back of the unit?

Average Joe

New member
I've been looking for head units recently that have a USB port so that I might plug in a thumbdrive with music.

I've seen a few different stereos, such as the Alpine CDA-105, that indicate there is a USB port on the rear of the unit.

How does this work exactly? Would I have to have the faceplate off to use the thumbdrive? Does the port get installed somewhere else in the car? Please explain.
 
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