An operating system is a collection (or suite) of programs that manages and controls the computer. Operating systems have many functions: A user interface is a program, or suite of programs that ...

Charles Kalko is a big fan of trusted operating systems. With PitBull from Argus Systems Group Inc., he’s used them to lock down vital functions that run his business-to-business barter site.

Standard operating system (OS) methods for alerts and messages can often be more accessible than something custom made, in particular for users of assistive technology.

iOS stands for iPhone Operating System. It's the standard mobile operating system for Apple iPhones. It powers the device's memory and processes, and it's needed to run software.