What is iPhone sdk?

Question

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Answer 1

iPhone SDK is available with tools and interfaces needed for developing, installing and running custom native applications. Native applications are built using the iPhone OS’s system frameworks and Objective-C language and run directly on iPhone OS. Native applications are installed physically on a device and can run in presence or absence of network connection.

Answer 2

Software Development Kit from Apple that gives you the opportunity to develop applications for iPhones. Most short answer i can give you.