Why doesn’t ZIP Compression compress anything?

Question :

Why doesn’t ZIP Compression compress anything?,

Answer :

A 398MB directory was only compressed to 393MB using 7Z and Normal ZIP compression. Is this normal? If so, why do people continue to use ZIP on Windows?

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If you’re compressing things that are already compressed (AVI, JPEG, MP3), you won’t gain much other than packing everything in a single file.

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Disclaimer :

The answers provided above are only to be used to guide the learning process. The questions above are open-ended questions, meaning that many answers are not fixed as above. I hope this article can be useful, Thank you