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A mobile operating system, is a a mobile platform, or a handheld operating system, is the operating system that controls a mobile device or information appliance—similar in principle to an operating system such as Windows, Mac OS X, or Linux that controls a desktop computer or laptop. However, they are currently somewhat simpler, and deal more with the wireless versions of broadband and local connectivity, mobile multimedia formats, and different input methods.
Android is a mobile operating system for mobile devices such as mobile phones and tablet computers developed by the Open Handset Alliance led by Google.Android consists of a kernel based on the Linux kernel, with middleware, libraries and APIs written in C and application software running on an application framework which includes Java-compatible libraries based on Apache Harmony.Android uses the Dalvik virtual machine withjust-in-time compilation to run compiled Java code. ( Source :wikipedia )
Some other mobile operating systems are Symbian , iOS , BlackBerry OS , Windows CE etc.