Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android’s user interface is mainly based ondirect manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, andAndroid Wear for wrist watches, each with a specialized user interface. Variants of Android are also used onnotebooks, game consoles, digital cameras, and other electronics.>
Originally unveiled in 2007, for the iPhone, it has been extended to support other Apple devices such as the iPod Touch (September 2007), iPad (January 2010) and iPad Mini (November 2012). As of January 2015, Apple’s App Store contained more than 1.4 million iOS applications, 725,000 of which are native for iPads. These mobile appshave collectively been downloaded more than 100 billion times.