The Apple iOS, earlier referred to as the iPhone OS, is Apple’s proprietary mobile platform. Initially developed only for the iPhone, this OS has come to be used for all Apple devices, including the iPod Touch, Apple TV and the iPad.
Apple does not support third-party developers for the iOS. The Apple App Store now features about 3,00,000 iOS apps and its main rival on the horizon now seems to be the Google Android Market.
The iOS, derived from the original Mac OS X, especially supports the use of multi-touch gestures, each of which has a unique description and function.