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MP3 \noun\ also known as MPEG 1, Layer 3 is a compression technology developed by the Fraunhofer Institute in Erlangen Germany (I’ve been there many times, cool spot), along with other engineers. This technology shrinks the original audio file to about 1/10 the size depending on sound quality and allows music to be more portable. So remember to say danke!, the next time you are listening to your iPod.