iOS
iOS is the operating system used on the iPhone. It manages the device and provides the interfaces on which applications run
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
Design and development for iOS should account for the interaction conventions of the operating system, permissions, accessibility and compatibility between versions. Distribution channels and their conditions may depend on context; they are not a fixed part of the system's definition. An application needs testing against real tasks, and its functions need maintaining as the software and compatible devices evolve.
Also known as
iPhone OS
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