Virtual Machines are instanced computers that allow for experimentation, emulation of other operating systems, and even dangerous activity like malware analysis to happen within a temporary and confined environment. WSL on Windows is a great way to integrate a Linux workflow into your existing experience, but it doesn't provide you with a full desktop OS with a GUI.
If you're looking for an enterprise solution, you will likely need to pay for the licensed versions of the most popular VM software to avoid terms of use issues. However, if you're looking for some personal use options there are a handful of great VMs that work great and are easy to setup.
