USB on stereo question

I hope this is the correct place to ask this question. I notice that
some new stereos come with a USB connection. I am trying to figure out
the purpose of it. I have visited a number of electronic stores and
asked, but I keep getting different answers. Is the USB to connect a
MP3 player, so you can play the songs from your MP3 player on your
stereo? Is the USB to connect your computer to your stereo, so you can
use the speakers on your stereo for music being played on your
computer? This would mean both would need to be in the same room which
would not make any sense, but maybe so. Is the USB used to connect a
flash or thumbdrive which contains MP3 files which you can then play on
your stereo? This is the reason I would be interested. Anyone have any
idea what is the real answer? I probably should take my flash drive
next time, and plug it in the see if it works.

Thanks

Tom

.

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