In VirtualBox terminology, the operating system on which you install VirtualBox (i.e. your regular OS) is called the host. The operating system you install within VirtualBox (i.e. inside the virtual machine) is called the guest.
In VirtualBox terminology, the operating system on which you install VirtualBox (i.e. your regular OS) is called the host. The operating system you install within VirtualBox (i.e. inside the virtual machine) is called the guest.