Programming language for iphone apps

what OS does the iphone use? what programming language does it base on?
who creates and sells apps for the iphone? Anyone or just apple?
i mean does apple want to authorize or licence every application for it's iphone or is it opensource for all?
thanks :))
-

Objective C. Anyone can create an app. To sell the app, you must be a registered developer, and Apple handles distribution (and approves apps prior to release).
http://developer.apple.com/iphone/

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