What Does Mobile Operating System (Mobile OS) Mean?

A mobile operating system (mobile OS) is an OS built exclusively for a mobile device, such as a smartphone, personal digital assistant (PDA), tablet or other embedded mobile OS. Popular mobile operating systems are Android, Symbian, iOS, BlackBerry OS and Windows Mobile.

Techopedia Explains Mobile Operating System (Mobile OS)

To adapt to inherent mobile device environments, a mobile OS runs on limited resources emphasizing communication, such as random access memory (RAM), storage and central processing unit (CPU) speed.