Android is an open-source operating system developed by Google and the Open Handset Alliance for use in mobile devices. It was founded in 2003 and purchased by Google in 2005. Key features of Android include support for multiple apps running simultaneously, optimized graphics, and an app marketplace. Major versions of Android include 1.5 Cupcake, 1.6 Donut, 2.0/2.1 Eclair, 2.2 Froyo, 2.3 Gingerbread, 3.0/3.2 Honeycomb, 4.0 Ice Cream Sandwich, 4.1/4.3 Jelly Bean, 5.0/5.1 Lollipop, and 6.0 Marshmallow. While Android