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From Emulation or virtualization?:

Emulation is what we do when we try to make one system behave like or imitate a different system. We want to take System A (something we already have) and give it the inputs we would normally use for System B (which we may not have) and have System A produce the same results as System B.
Virtualization is a technique for using computing resources and devices in a completely functional manner regardless of their physical layout or location. This includes splitting a single physical computer into multiple "virtual" servers, making it appear as though each virtual machine is running on its own dedicated hardware and allowing each to be rebooted independently.

This category contains pages about virtualization technologies such as hypervisors, hypervisor control tools, cloud managment systems, etc. If you are looking for articles about emulation, see Category:Emulation.