DMZ 
demilitarized zone 
Originally, this term defined a closely monitored no-man's land placed between rival nations, for example, the buffer zone established between North and South Korea after the Korean Conflict in the 1950s. Networking has co-opted the term and used it to refer to an unprotected subnet connected to a local network but outside the peripheries of a firewall. A DMZ allows you to protect certain computers behind a firewall while allowing one or more other computers full exposure to other networks. A DMZ is often used for servers or gaming computers that require full access to the Internet in order to function properly.