The document provides a history of Android versions from 2007 to 2014. It describes the early alpha and beta releases from 2007 to 2008. It then lists and describes the major commercial versions of Android from 2009 to 2014 including Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich, Jelly Bean, KitKat and Lollipop. For each version it provides the release date, version number, and key new features and improvements introduced in that version.