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[ Embarrassed now, realizing how rude all of that was... What a nice and patient dragon. :c ♥ ]
I'm sorry. An MP3 is... It's like a kind of file on a computer, for music. And so they make MP3 players as well that only store those kinds of files, so you can listen to your music wherever. I'm not very good at computers, so I'm sure someone else could give a better explanation.