There’s a couple ways to interpret compression here
Assuming you mean compression as it relates to mixing music:
Compression is just a term that describes how much the loudest and softest parts of the original song have been balanced towards the middle. Decompression would mean undoing those changes, I would assume, but I’m not sure if that term is used here.
Assuming you mean compression as it relates to data:
Think of compressing and decompressing data as using a secret code between friends. For example, text abbreviations can be considered one sort of code. If you can get your friend to agrees that “laughing out loud” is equivalent to “LOL”, that’s compression. Your original text that was 17 characters long, but the compressed text is only 3 characters long. Vice versa, decompression is converting LOL back into the original. In order to store lots of information on a CD, it might be compressed into a smaller version of itself using a special code, that can be reversed later to decompress it
When it comes to CDs
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