Creating an iPhone application requires using the same development tools as a Mac OS X application but with a different design approach tailored to the mobile environment of the iPhone. An iPhone application needs to leverage the strengths of the iPhone OS while avoiding irrelevant or impractical desktop features, and must organize its user interface efficiently given the smaller screen size by focusing on essential user information.

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Creating an iPhone Application
At a high level, the process for creating an iPhone application is similar to that for creating a Mac OS X application. Both use the same tools and many of the same basic libraries.
Despite the similarities, there are also significant differences. An iPhone is not a desktop computer; it has a different purpose and requires a very different design approach. That
approach needs to take advantage of the strengths of iPhone OS and forego features that might be irrelevant or impractical in a mobile environment. The smaller size of the iPhone
and iPod touch screens also means that your application’s user interface be well organized and always focused on the information the user needs most.
iPhone OS lets users interact with iPhone and iPod touch devices in