This document provides an overview of Android, including its history and development by Google. It describes Android as an open-source, Linux-based operating system designed for touchscreen devices. The document also outlines the Open Handset Alliance collaboration, key features of Android like app multitasking and media support, versions of Android from initial to current releases, and compares Android to other mobile operating systems. It concludes that Android has become the most widely used mobile OS in the world.