In the initial days, it was primarily developed as an open-source alternative to iOS – iPhone, and in no time it became famous. And its newly built UI was loved by many users because they were able to perform gestures like swiping, pinching, and tapping. In September 2008, the very first stable version of Android OS was released with the HTC Dream device. It was founded by an American computer programmer named “ Andy Rubin” and then further guided by Google. Android is one of the most popular Linux-based mobile operating systems in the world.