It is a Linux based OS for touch screen devices such as smart phones and tablets. lt was developed by Android Inc. founded in Palo Alto, California in 2003 by Andy Rubin and his friends.
In 2005, Google acquired this. A team led by Rubin developed a mobile device platform powered by the Linux Kernel. The interface of Android OS is based on touch inputs like swiping, tapping, pinching in and out to manipulate on screen objects. In 2007 onwards this OS is used in many mobile phones and tablets.