A server on your network needs to be accessed by external users. The content of the server should be publicly available and does not contain any confidential information. Where should you place it?
Answer Description
A DMZ (Demilitarized Zone) is a part of a network that is somewhat protected, and allowed to be accessed externally and internally. However, it is also separated from the internal network, allowing a more secure environment internally.
Wikipedia
In computer security, a DMZ or demilitarized zone (sometimes referred to as a perimeter network) is a physical or logical subnetwork that contains and exposes an organization's external-facing services to an untrusted network, usually a larger network such as the Internet. The purpose of a DMZ is to add an additional layer of security to an organization's local area network (LAN): an external network node can access only what is exposed in the DMZ, while …
DMZ (computing) - Wikipedia, the free encyclopedia