What is Android ???

Android is a mobile operating system (OS) based on the Linux kernel and currently developed by Google. 

Platform usage in Android

Charts in this section provide breakdowns of Android versions, based on the devices accessing the Play Store in a seven-day period ending on March 2, 2015. Therefore, these statistics exclude Android forks that do not access Google Play, such as Amazon's Fire tablets.

Version	Code name	Release date	API level	Distribution
2.2	Froyo	May 20, 2010	8	0.4%
2.3.3–2.3.7	Gingerbread	February 9, 2011	10	6.9%
4.0.3–4.0.4	Ice Cream Sandwich	December 16, 2011	15	5.9%
4.1.x	Jelly Bean	July 9, 2012	16	17.3%
4.2.x	Jelly Bean	November 13, 2012	17	19.4%
4.3	Jelly Bean	July 24, 2013	18	5.9%
4.4	KitKat	October 31, 2013	19	40.9%
5.0	Lollipop	November 3, 2014	21	3.3%

Version	Code name	Release date	API level	Distribution
5.0	Lollipop	November 3, 2014	21	3.3%
4.4	KitKat	October 31, 2013	19	40.9%
4.3	Jelly Bean	July 24, 2013	18	5.9%
4.2.x		November 13, 2012	17	19.4%
4.1.x		July 9, 2012	16	17.3%
4.0.3–4.0.4	Ice Cream Sandwich	December 16, 2011	15	5.9%
2.3.3–2.3.7	Gingerbread	February 9, 2011	10	6.9%
2.2	Froyo	May 20, 2010	8	0.4%