Carbon & Cocoa- and the difference between them

As a year old Mac user (meaning, I've been using the Mac for a year, I personally am not a year old) one thing has always had me a bit miffed
What's the difference between Cocoa and Carbon?
My understanding is that is has something to do with the appearance of an app- and how it was created.
Just a little curious, that's all!
Cheers

This link may be helpful.
http://www.macworld.com/news/2001/01/04/macosx/index.php

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