There is an app that I want to get, but it is not in the iTunes App Store. Is there a way I can request to get it into the App Store?
How do I request an app to be added to iTunes that has already been made?
Do you mean you saw an app on another platform and you want to see it on the Apple App Store? In that case, the answer is NO (well, you might be able to write to the developers of that particular app to see if they're interested in producing an iOS version). If you mean you have an app you wrote that you want to put on the App Store, you'll need to read through Apple's documentation on app submissipon.