Abstraction
Hiding complex detail behind a simple, predictable way of asking for things.
Glossary
Virtualization
Presenting one set of resources as if it were another, so software can be more flexible.
In one line
Presenting one set of resources as if it were another, so software can be more flexible.
Also calledvirtual machines
Virtualization is a polite illusion. It lets software believe it has a component or a machine all to itself, while in truth resources are being shared and arranged behind the scenes. The software behaves as though its private world were real, and for its purposes, it is.
Drivers and translation layers make this possible, standing between the illusion and the reality and keeping the two consistent. They catch each request meant for a real part and quietly direct it to whatever is actually providing the service.
The benefit is flexibility. One physical machine can be divided to do the work of many, or several can be made to look like one, all without the software inside needing to know or care. Resources can be shifted and rearranged while the illusion holds steady.
Virtualization also brings isolation. Because each virtual world is kept separate from the others, trouble in one need not disturb its neighbours, which makes sharing a single machine among many tasks both safer and more orderly.
In practice
In practice, virtualization is like dividing one large building into several self-contained apartments. Each resident lives as though the space were entirely their own, unaware of the others, while shared plumbing and wiring are quietly managed behind the walls. Software can be given its own private world in just this way.
