DMZ
Alternatively referred to as a DMZ host, the DMZ is short for DeMilitarized Zone and prevents users outside a local or wide area network from obtaining access to company data that is only for internal use and prevents access to all other internal services. By default DMZ is disabled on routers to add an extra layer of security. In some situations when enabling port forwarding on a network router the DMZ may need to be enabled.
Also see: Network definitions