What is the most popular operating system used on personal computers?

The most popular operating system used on personal computers is Microsoft Windows. This is largely due to its user-friendly interface, wide range of compatible software, and strong support from hardware manufacturers. Windows has established itself as the standard operating system in many business and educational environments, which contributes to its dominance on personal computers. Its extensive ecosystem of applications, including productivity software, games, and various utilities, makes it the preferred choice for many users.

In contrast, other operating systems like Mac OS and Linux have significant user bases, but they do not match the widespread adoption and availability of Microsoft Windows. Mac OS is typically used on Apple computers and has a loyal following, particularly among creative professionals. Linux, while praised for its open-source nature and reliability, is primarily used by advanced users and developers who value customization over mainstream usability. MS-DOS, an older operating system, has largely been replaced by more modern systems and is not commonly used in today's computing landscape.