iOS is Apple's most advanced and feature-rich proprietary mobile operating system. It was released with the first generation of the iPhone. When introduced, it was named iPhone OS, and later it was renamed to iOS to reflect the unified nature of the operating system that powers all Apple iOS devices, such as the iPhone, iPod Touch, iPad, and Apple TV. iOS is derived from core OS X technologies and streamlined to be compact and efficient for mobile devices.
It utilizes a multitouch interface where simple gestures are used to operate and control the device, such as swiping your finger across the screen to move to the successive page or pinching your fingers to zoom. In simple terms, iOS assists with the general functioning of the device. iOS is really Mac OS X with some significant differences:
The architecture for which the kernel and binaries are compiled is ARM-based rather than Intel x86_64
The OS X kernel is open source, whereas the iOS kernel remains closed
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