What are MP3 files and how do they work?

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Prices: MP3 Players
Apple iPod touch (16 GB, MA627LL/A) Digital Media Player

16 GB (Built-in Memory), 4000 Songs, 4.2 oz., Audio Files: MP3, WAV, AAC, MP3 VBR, AIFF, Audible. Video Files: MPEG-4, H.264. Disp...

$270 - $401
Apple iPod nano Third Gen. Silver (4 GB, MA978LL/A) Digital Media Player

4 GB (Built-in Memory), 1000 Songs, 1.74 oz., Audio Files: MP3, WAV, AAC, MP3 VBR, AIFF, Audible. Video Files: MPEG-4, H.264. Disp...

$120 - $120
Apple iPod classic Sixth Gen. Black (160 GB, MB150LL/A) Digital Media Player

160 GB (Hard Drive), 40000 Songs, 5.7 oz., Audio Files: MP3, WAV, AAC, MP3 VBR, AIFF, Audible. Video Files: MPEG-4, H.264. Display...

$300 - $300