Android is a mobile operating system developed by Google, based on the Linux kernel and Java programming language, and designed primarily for touchscreen mobile devices such as smartphones and tablets. It’s user interface is mainly based on direct 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 AndroidTV for televisions, AndroidAuto for cars, and AndroidWear for wrist watches, each with a specialized user interface. Variants are also used on notebooks, game consoles, digital cameras, and other electronics.
Initially developed by Android Inc., which Google bought in 2005, the operating system was unveiled in 2007, along with the founding of the Open Handset Alliance – a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. Beginning with the first commercial Android device in September 2008, the operating system has gone through multiple major releases. As of May 2017, Android has two billion monthly active users, and it has the largest installed base of any operating system. (Wikipedia)