This video provides an introduction to virtualization. It gives an overview of the technology and some of the reasons people are moving towards virtualization.
This is a nice article from “Data center Knowledge”, which explains the meaning of “Virtualization” and gives some Pros/Cons for running a virtual environments.
From the article:
How does virtualization work?
Simply put, server virtualization allows you to take a single piece of hardware and transform it into multiple “virtual” machines. To create a virtual environment, there are many solutions available with the most popular being VMware, Microsoft and Xen.