"Runs multiple operating systems at once"
VirtualBox creates a virtual machine inside your own computer so that you can install a second operating system that works completely independently of what you have installed now.
If you are a developer and need to test applications on other systems this is a good way to do it, without complications and without spending money on virtual servers or second machines
Install a virtual computer to create a second disk with a different operating system than the one you use, ideal for Linux users inside a Windows computer.
In addition you will have access to the same components that the main computer printers and others will be totally shared.