iPhone SDKA software development kit (SDK) released by Apple that allows people to write applications for both the iPhone and the iPod Touch. The iPhone SDK includes the Xcode IDE, Instruments, iPhone simulator, frameworks and samples, compilers, Shark analysis tool, and more. To download the iPhone SDK you must have an Apple ID. Developers have long insisted that by providing a development platform for iPhone is one way that Apple can work towards preventing people from hacking the operating system used by the device, which is a stripped down version of Apple's own OS X operating system.
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