Hands-on virtualization with a 1990s Mac

Even if virtualization has been explained to you before, it's entirely possible that the definition didn’t stick. There are so many variations of this technology that we take it upon ourselves to periodically review its most basic functions. And because these variations aren't concrete enough to easily understand them, this time we’re including a virtualized desktop for you to play with!
What is virtualization?
The simplest definition is this: It’s the act of creating a virtual (rather than physical) version of something, including hardware platforms, storage devices, and computer network resources.