VirtualBox (aka Oracle VM VirtualBox) is an open-source “full virtualization” solution by Oracle Corporation. Basically it is a hypervisor, which makes it possible to install an unmodified OS on top of your existing host OS – these environments are generally termed as virtual machines or guest machines (the base machine the Host). Hypervisors i.e. VirtualBox provide a virtualization layer i.e. making it possible for the guest machines to access the abstracted hardware resources.