What operating system powers most web servers?

What operating system powers most web servers? Linux powers most web servers.

Linux is an open-source operating-system kernel used in many server distributions, including Ubuntu, Debian, Red Hat Enterprise Linux and Amazon Linux. Its reliability, configurability, security tools and lack of per-server licensing fees have made it a common foundation for hosting websites and online services.

Much of the modern Web runs on a Linux-based software stack. Popular web servers such as Apache HTTP Server and Nginx are widely deployed on Linux, while cloud platforms and container systems commonly use Linux environments underneath.

The wording can cause confusion because Linux is Unix-like rather than the original Unix operating system. Some surveys group Linux with other Unix-like systems, and their figures vary depending on whether they count websites, physical machines, cloud instances or identifiable systems. Windows Server is also important, especially for Microsoft technologies, but Linux is the standard trivia answer for most web servers.