Aside from being a plant used to make chocolate (did you know that the cocoa tree is one of the few trees where the flowers and fruit grow directly out of the trunk and lower branches?), Cocoa is also the native API for MacOSX. Most Cocoa programs are written in ObjectiveC?, although there also exist bindings for Java.
Cocoa has its roots (so to speak) firmly in the NeXTStep? operating system, and is based on YellowBox?, one of the NeXTStep? (perhaps Rhapsody??) APIs.
There is more to be said here, but I don't have time. AddToMe.
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