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An android is a robot or synthetic organism designed to look and act like a human, especially one with a body having a flesh-like resemblance. Although "android" is used almost universally to refer to both sexes, and those of no particular sex, "android" technically refers to the male form, while "gynoid" is the feminine form. Until recently, androids have largely remained within the domain of science fiction, frequently seen in film and television. However, advancements in robotic technology have allowed the design of functional and realistic humanoid robots.

Read here  >http://en.wikipedia.org/wiki/Android_(robot)

Android is an open mobile phone platform that was developed by Google and, later, by the Google-developed Open Handset Alliance. Google defines Android as a "software stack" for mobile phones.

A software stack is made up of the operating system (the platform on which everything runs), the middleware (the programming that allows applications to talk to a network and to one another), and the applications (the actual programs that the phones will run). In short, the Android software stack is all the software that will make an Android phone an Android phone.