Opperating System: is software that controls the execution of computer programs and may provide various services Eg. Windows XP, Vista, Android, iOS...
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An Operating System allows your computer to run, accept inputs, provide outputs, etc. It is the foundation of your computer software. It provides you your desktop, computes data, and so on.
Both Windows and the iPhone OS are operating systems in which they provide an interface between software and hardware, but that's where the similarities end. The iPhone OS is designed specifically...