Microsoft Windows is one of the popular operating system types and is preloaded on most new PC hardware.
Head-to-head in the competition with Microsoft Windows is Apple's macOS. macOS and Windows are both examples of proprietary operating systems.
Google's Android OS. is the primary OS for Google mobile devices like smartphones and tablets.
Apple's iOS is another mobile operating system used exclusively for iPhones, some of the most popular mobile devices on the market.
Linux is different from Windows and Apple in that it's not proprietary software but rather a family of open source systems.