Compressing files (almost same size as original)...?

hello.
Anytime i have to compress a file, in order to quickly send it over email, i right click on the file that needs to be compressed, and then i choose "compress". I then get a zip file that is barely smaller than the original file (from 7.8MB to 7.2MB), which makes compression almost pointless.
So i figured that its just because i'm using the generic stock file compression application, whatever that is..... so i decided to download stuffit expander.
But i get the same result whether i compress it into a .zip file, or a .sitx file.
I'm so confused, but i'm sure this is something very simple. Am i misunderstanding the whole concept of what file compresison is?
I know that this is such an elementary question, but thanks for your time.
Any help would be appreciated.
thanks!!

ah, ok. I totally understand.
I was trying to compress an mp3, which is already a compressed format.
Sorry for my lack of knowledge.
Yet, I will also be needing to compress scanned text documents in jpg format.
I assume i will have the same issue because jpgs are already compressed formatsas well?

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Compressing files (almost same size as original)...?

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