A system software component that is external to the operating system kernel. If the phrase is used to refer to the operating system itself, it is redundant because an operating system "is" software.

An operating system is a master control program that runs the computer system. In all environments, except for specialized scientific and process control applications, the operating system (OS) ...

Today’s operating systems are more sophisticated and feature-rich than ever before, which makes them substantially more useful to the enterprise but also adds to security vulnerability—unless the ...

When it comes to the operating systems you can actually use on your computer, there are really only three main ones that are ever brought up. You have Windows 11, macOS, and Linux (or, more accurately ...