What is meant by the term DMZ in the context of routers and network segments?

DMZ (Demilitarized Zone) is a separate network segment that isolates an organization's internal protected network from the external internet. In the context of routers and network segments, DMZ is used to host public services (such as web servers, mail servers) to restrict access to the internal network and enhance security.

The main idea is that services in the DMZ are accessible from the internet but are isolated from the internal network so that in case these services are compromised, the attacker does not gain direct access to internal resources. Routers and firewalls are configured to control traffic between the internet, DMZ, and internal network.