What is Virtualization? (Simplified)

Understanding virtualization locally and in the cloud

Joe Cardillo
3 min readOct 29, 2021

Virtualization is a way of creating a virtual version of something.

With regard to computers, that “something” could be CPU, RAM, storage, or networking, for example.

Virtualization makes it possible to create “fake” (or virtual) versions of these things, which would then allow you to run a computer inside your computer. (Insert Inception GIF.)

This means you could run Windows on your MacBook. Linux on Windows. Or even Windows on Windows.

How is this possible?


A hypervisor makes this possible. A hypervisor is a piece of software (like any other application you can install on a computer). It’s what allows you to create computers inside other computers.

The hypervisor essentially borrows (or pools) resources from the underlying physical machine (or host), so they can be used in a virtual environment.

In other words, it makes virtual hardware components, like CPU, RAM, GPU, storage, and networking.

Once a hypervisor is installed on a host, you can install or build virtual machines (VMs) on top of it.

What is a virtual…