What is a file with a ZIP extension?

Related questions

1. Does a zip file reduce file size?
2. Can I get WinZip for free?
3. Does zip reduce file size?
4. Can you zip pictures?
5. Can videos be zipped?
6. Can I zip photos?
7. What happens if you zip a file?
8. Why is my ZIP file not smaller?
9. Can I unzip a file on my iPad?
10. How does zip reduce file size?

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