The terms "domain", "guest" and "virtual machine" are often used interchangeably, but they have subtle differences. A domain is a configurable set of resources, including memory, virtual CPUs, network devices and disk devices, in which virtual machines run. A domain or virtual machine is granted virtual resources and can be started, stopped and restarted independently of other domains or the host server itself. A guest is a virtualized operating system running within a domain. Multiple guests can run on the same Oracle VM Server, each within its own domain.