[ororroro]

3rd most installs. Windows 11 identifies as windows 10 for reasons.

[Dalewyn]

That's because the kernel identifies as NT10.0. Internally it's the same as Windows 10.

Similarly, Windows 2000 and XP identify as NT5.0 and 5.1 respectively, and Windows Vista/7/8/8.1 identify as NT6.0, 6.1, 6.2, and 6.3 respectively.

Incidentally, this is also why drivers often are cross-compatible along certain Windows versions.

[XCSme]

What does NT stand for?

[Dalewyn]

There are a number of theories and backstories[1], but most commonly it's understood that it once stood for New Technology.

[1]: https://en.wikipedia.org/wiki/Windows_NT#Naming