A Demilitarized Zone or DMZ is a network segment that is separated from other networks. Many organizations use a DMZ to separate their Local Area Networks (LANs) from the Internet. This puts additional security between their corporate network and the public Internet.
In computer security, a DMZ, or demilitarized zone is a physical or logical subnetwork that contains and exposes an organization's external services to a larger untrusted network, usually the Internet.