Virtualization is the creation of a virtual version of some component on top of the environment. For example, creating a virtual architecture - using QEMU to emulate ARM architecture on an x86 machine. Or using WINE to implement Windows on Linux.

VirtualizationMoreInformation Virtualization More Information

QEMU

QEMUpuppy - Visualization of Puppy to boot on other OSs

VirtualBox

VMwarePlayer

Wine

VMXpupguest Puppy Linux as a Virtual Guest

SoftwareVirtualization Virtualization Software Index

forum topic

Using Qemu to emulate RaspberryPi

Virtualization on Wikipedia