DMZ, or Demilitarized Zone, in networking refers to a subnetwork that is configured to act as a buffer between a private network (e.g., company's intranet) and an untrusted external network (e.g., the internet). This intermediate zone provides an additional layer of security, as it isolates the internal network from direct exposure to external threats.

The DMZ typically contains servers that need to be accessible from both the internal and external networks, such as web servers, email servers, and FTP servers. By placing these servers in the DMZ, organizations can protect their internal networks while still allowing necessary communication with external users. Security measures, such as firewalls and intrusion detection systems, are often implemented monitor and control traffic between the DMZ and both the internal and external networks.