DMZ - DeMilitarized Zone

Computer slang used for a protected network that sits between the Internet and the corporate network.
Sometimes called a perimeter network.

A DMZ is a computer network that is accessible from two other computer networks that have no direct contact with each other. Often, one of these networks is the Internet and the other is a local, internal network. There is no direct connection between the Internet and the local network, but both of them can access an intermediate network, a demilitarized zone. DMZs are often used for special servers, such as web servers, which must be accessible from two separate networks.