iOS is the mobile operating system that was developed and distributed by APPLE.Inc.Unlike other mobile OS like Android and Symbian, which are also well known OS used in Smartphones, it is only available to be used in the devices made by the APPLE.Inc. It was initially unveiled in the year 2007 to be used in the iPhone. It was later made available in iPad , iPod touch and the second-generation Apple TV as well.
Apple's App Store contained more than 900,000 iOS applications, 375,000 of which were optimised for iPad. These apps have collectively been downloaded more than 50 billion times. It had a 21% share of the smartphone mobile operating system units shipped in the fourth quarter of 2012, behind only Google's Android. In June 2012, it accounted for 65% of mobile web data consumption (including use on both the iPod Touch and the iPad). At the half of 2012, there were 410 million devices activated. According to the special media event held by Apple on September 12, 2012, 400 million devices have been sold through June 2012.
iOS is derived from OS X, with which it shares the Darwin foundation. iOS is Apple's mobile version of the OS X operating system used on Apple computers.
In iOS, there are four abstraction : the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The current version of the operating system (iOS 6.1.3) dedicates 1-1.5 GB of the device's flash memory for the system partition, using roughly 800 MB of that partition (varying by model) for iOS itself.
On June 10, 2013, Apple announced iOS 7 at its annual WWDC conference.
iOS currently runs on iPhone, iPad, iPod Touch and Apple TV.
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