Oracle VM VirtualBox is a free and open source hosted hypervisor for computers. A VirtualBox (VB) is a software virtualization package that installs on an operating system as an application. VirtualBox allows additional operating systems to be installed on it, as a Guest OS, and run in a virtual environment.
Instruction for Install Virtual box on windows:
Download virtual box.
Link for virtual box:
After Downloading Virtual box click on Install. It is a very simple process.
A default window is open which is an Oracle Vm VirtualBox in you simply click on next so the process started.
After clicking on next, comes with Custom Setup, in which you can change a location where to install or click on next.
Click install for Custom installation.
Here you will see the VirtualBox is installed properly. This image is a Homepage of VirtualBox Manager.
You can also see How to install Ubuntu on Virtual box for windows.
You can also see what is Ubuntu.