VirtualBox is a general-purpose full virtualizer for x86 hardware, targeted at server, desktop and embedded use. It creates a software interface to emulate hardware (including monitor, network card, RAM, hard drive, etc.).
VirtualBox is a VM (virtual machine) platform, exactly same as VMWare, Virtual PC etc. Basically it is a software, that is being distributed by Oracle, which you can use to emulate multiple operating systems which in your part is called Guest OS and your main machine is your Host OS. The Guest OS can be any operating system like BackTrack, Windows 7, Fedora and more.
Where can I download Virtual Box?
You can download Virtual Box in here.
In this guide, we are using BackTrack 5, so you must download the VirtualBox for Linux hosts.
How to install Virtual Box in BackTrack 5?
After you have downloaded the VirtualBox package:
Navigate to the download folder using the “cd” (change directory) command.
After navigating to your download folder proceed by entering the command below:
sudo dpkg -i filename.deb
That’s it. You have just installed VirtualBox in BackTrack 5 OS.