Introduction:- Android Operating System

Android is a Mobile Operating System (OS) based on the Linux Kernel that is currently developed by Google. With a User Interface based on direct manipulation,
 Android is designed primarily for touchscreen mobile devices such as smartphone and tablet computers, with specialized user interfaces for televisions (Android T.v), cars (Android Auto), and wrist watches (Android Wear).
 The OS uses touch inputs that loosely correspond to real-world actions, like swiping, tapping, pinching, and reverse pinching to manipulate on-screen objects, and a virtual keyboard v. Despite being primarily designed for touchscreen input, it also has been used in game consoles, digital cameras , and other electronics.
          As of 2011, Android has the largest installed base of any mobile OS and as of 2013, its devices also sell more than  Windows, iOS, and Mac OS devices combined.  As of July 2013 the Google Play store has had over 1 million Android apps published, and over 50 billion apps downloaded. A developer survey conducted in April–May 2013 found that 71% of mobile developers develop for Android.

Android's source code is released by Google under open Source licenses, although most Android devices ultimately ship with a combination of open source and proprietary software.Android 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.
Android is popular with technology companies which require a ready-made, low-cost and customizable operating system for high-teach devices.