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It is proprietary software, although some parts of it are open source under the Apple Public Source License and other licenses.
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It is the basis for three other operating systems made by Apple: iPadOS, tvOS, and watchOS.
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It is the world's second-most widely installed mobile operating system, after Android. It is the operating system that powers many of the company's mobile devices, including the iPhone the term also includes the system software for iPads predating iPadOS-which was introduced in 2019-as well as on the iPod Touch devices-which were discontinued in mid-2022. IOS (formerly iPhone OS ) is a mobile operating system developed by Apple Inc. Proprietary software except for open-source components
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