WSL is a way for developers to access the power of both Windows and Linux at the same time on a Windows machine. As long as your running a windows 10 or higher you can install a linux distrubution such as Ubuntu or Debian use Linux applications, utilities, and Bash command-line tools directly on Windows. There are a couple options for installing but I would recommend starting on the ,manual installation page so that you can have a better understanding of what and how the program works.
https://learn.microsoft.com/en-us/windows/wsl/install-manual