This document provides information about Android operating system and its history and features. It discusses:
- Android is an open-source software stack for mobile devices, including an operating system, middleware and key applications. It was developed by the Open Handset Alliance led by Google.
- The different versions of Android from 1.0 to the current 7.0, with each subsequent version adding new features and improvements related to performance, battery life, security and more.
- Integrated development environments that can be used to develop Android apps, with Android Studio being the official IDE recommended by Google.