Android -an operating system for mobiles

Android is a mobile operating system running on the Linux kernel. It was initially developed by Google and later the Open Handset Alliance.It allows developers to write managed code in the Java language, controlling the device via Google-developed Java libraries.
The unveiling of the Android platform on 5 November 2007 was announced with the founding of the Open Handset Alliance, a consortium of 48 hardware, software, and telecom companies devoted to advancing open standards for mobile devices.Google released most of the Android code under the Apache License, a free software and open source license.

Android is a software stack for mobile devices that includes an operating system, middleware and key applications. The Android SDK provides the tools and APIs necessary to begin developing applications that run on Android-powered devices.
This site provides information about Google projects based on the Android platform, such as external libraries that extend the Android platform, Android applications, hosted services and APIs, the Android Developer Contest, and more. Everything on this site is provided by Google for the benefit of Android developers.
If you are looking for general information about Android, please visit the www.android.com site. If you are interested in developing applications for Android devices, please visit the Android Developers site at developer.android.com