What does Android device do?

Android is an array of software intended for mobile devices that features an operating system, core applications and middleware. An Android device may be a smartphone, tablet PC, e-book reader or any type of mobile device that requires an OS. Android is developed by the Open Handset Alliance, which is led by Google.

What is the difference between a smartphone and an Android?

Android is actually an operating system that powers Google and other smartphones, while smartphone is any type of phone that allows advanced computing capability.