Android is mobile Operating System made by American Company Google.
The version history of the Android mobile operating system began with the release of the Android beta in November 2007. The first commercial version, Android 1.0, was released in September 2008. Android is under ongoing development by Google and the Open Handset Alliance (OHA), and has seen a number of updates to its base operating system since its initial release.Google release android version in Alphabetical order.
The most recent being Android 6.0 "Marshmallow", released in October 2015. Android Marshmallow was initially announced at Google I/O on May 28, when it was released as the Android M developer preview. Several updates to the preview came out before Marshmallow was officially named on August 17. You can learn more about Android by clicking here.