Operating System is a core, which controls the basic operation of devices. A mobile operating system (mobile OS) is an OS built exclusively for mobile device such as a Smartphone, Personal Digital Assistant (PDA), Tablet or other embedded mobile OS. A mobile OS is a set of data and programs that runs on a mobile device which manages all the hardware and optimizes the efficiency of the application software in the device.

A mobile OS is responsible for identifying and defining mobile device features, activity and functions, including keypads, application synchronization, emails, messaging. A mobile OS is similar to a standard OS like Windows, Mac, Linux but it is relatively simple and light which primarily manages the wireless variations of local and broadband connections, multimedia and various input.

Popular mobile operating systems are Android, iOS, BlackBerry OS, Symbian and Windows Mobile. One of the most leading mobile operating system is Android.