Android is an operating system for mobile devices. It is mostly used for cell phones, like Google's own Galaxy Nexus, as well as by other phone manufacturers like HTC and Samsung. It has also been used for tablets such as the Motorola Xoom and Amazon Kindle Fire. Android's kernel is based on Linux. You can download free games or play free o-nline games for Android phones.
Android 4.0 users can download games for Android 4.0 via 9Game.com.