Introduction

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use.

FYI

What’s the Diff: VMs vs. Containers

Links

Virtual machine (Wikipedia)

VirtualBox (home)

Building a VirtualBox Test Lab 05. Setting up a virtual lab (YouTube)

Building a VirtualBox Test Lab:- 12. Using VirtualBoxs advanced VM options (YouTube)