What Is a Virtual Machine and What Is It For
Testing operating systems, isolating unsafe software, and the most used tools to create them.
A virtual machine (VM) is a complete computer simulated inside your real computer — with its own operating system, working as if it were an independent physical machine.
Simple explanation
Picture a house inside another house, completely separate and independent on the inside, even though it shares the same outer structure. You can install Linux inside your Windows (or the other way round), use it, and even delete it entirely, without your main system being affected at all.
Most common use cases
- Trying out a Linux distribution without actually installing it on your machine.
- Running old software that needs an older operating system.
- Isolating something potentially unsafe (testing a dubious program) without risking your real system.
- Practising system administration without fear of genuinely "breaking" anything.
Programs for creating virtual machines
VirtualBox (free, the most used for beginners) and VMware (with a free version for personal use) are the most common options — we cover how to install the first one in this guide.
The price paid for this isolation is performance: a virtual machine is always somewhat slower than the real physical system, since it shares the same hardware resources with your main system.
Frequently asked questions
Can a virtual machine damage my main system?
No, it's completely isolated — any problem inside the virtual machine (including deleting it entirely) doesn't affect your main operating system.
Do I need powerful hardware to use virtual machines?
The more RAM and the better the processor you have, the better it will run, since the virtual machine shares resources with your main system. For light tasks, normal modern hardware is enough.