Windows Subsystem is a technique to emulate Linux environment on Windows Operating System.
https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux
Here is Windows subsystem installation guide.
https://docs.microsoft.com/en-us/windows/wsl/install-win10
Windows Subsystem is similar to VM but much faster.
It provides command line tool where all Linux commands are available to use. In order to access outside data using VM, we need to setup configuration but Window Subsystem support outside data access originally.
For web developer’s view, if we host a web server inside a VM, we cannot access to it from outside directly, but we can host a web server using the Windows Subsystem command line, and access to the server using Windows Browser for example on https://localhost:8000.
