A virtual machine is a computer that does not exist, running on a computer that does. That sounds like a riddle, but it is a fair description. If you have ever opened a cloud server, run Windows on a Mac, or used almost any website, you have touched one.
Source: [Dev.to](https://dev.to/prateek_navani_157c1ed2b7/a-simple-explanation-of-what-a-virtual-machine-actually-is-2nob)