A DMZ (Demilitarized Zone) is a network segment that acts as a buffer between a trusted internal network (such as a corporate intranet) and an untrusted external network (such as the Internet). It is a physical or logical subnetwork that contains and exposes an organization’s external-facing services to a larger, untrusted network such as the Internet.
The purpose of a DMZ is to add an extra layer of security to an organization’s network. By segregating the external network from the internal network, the DMZ acts as a buffer, allowing the organization to maintain a secure internal network while providing access to external resources.
For example, a web server in the DMZ can be accessed by anyone on the Internet, but the web server cannot access any other systems or resources on the internal network. Similarly, the internal network can access the web server in the DMZ, but cannot access any other systems or resources on the external network.