Ah yes, Windows Subsystem for Linux (WSL)— that one “operating system” that’s overshadowed by Windows, Linux, and macOS (in that order, of course):

Stack Overflow Developer Survey 2022 results
At least WSL isn’t as unpopular as the enigmatic BSD OS…
But calling WSL an “operating system” might not be so apropos. Instead, it’s really a Windows feature that enables users to run a Linux environment without requiring a full virtual machine. Released in 2016, WSL has two versions: WSL 1 and WSL 2, the latter of which is more powerful, but also requires… (wait for it)