Zip is not really smaller than original.

I have a file that is 194 MB. If I right-click and choose to make an archive, I get a zip file that is 193.3 MB. Can this be right? I think this form of archive is only useful for a group of files that need to be bundled. Why doesn't it compress the file?

To add to Roger's list, that includes most movie file formats.
To comment on Steve's comment, I find that text can compress quite a lot.
You may find no compression gain because there is a certain amount of overhead attached to a compressed file, and for small files or files that are already in a compressed format this overhead may be more than the space savings.

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