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MP3 is for audio files. MP4 is for video files, it allows the large video files to be compressed into very small files and quality is not affected. With a MP4 player and a broad band connection you can watch video over the internet immediately and with perfect quality.
phail lol!!!
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Elone: Thank you so much...I learned something new today. 
to saix1991: I have no idea what you are talking about.
Answer this Question: "What is a mp4?"
What is a mp4?
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I have seen a couple of people ask about mp4 players. I know what a mp3 is. What is a mp4, and how does it differ from a mp3? Sorry if this sounds silly, but I must be out of the loop.