Virtualization software allows multiple operating systems to run simultaneously on the same computer. Such software systems for PCs often involve a host operating system which runs the virtualization software and supports any number of guest operating systems.
![Chapter 24. Virtualization](https://cdn-ak-scissors.b.st-hatena.com/image/square/2ea9a85896580e9f415422ac2ddb117898b0d04a/height=288;version=1;width=512/https%3A%2F%2Fdocs.freebsd.org%2Fimages%2Flogo-164x164.png)