A more thorough explanation:

A demilitarized zone is an area where no military forces or military installations are allowed. This can be a territorial area within a country or between countries.

For example, the Korean Demilitarized Zone (DMZ) is a strip of land that runs across the Korean Peninsula and separates North and South Korea. It is a buffer zone that was established after the Korean War to prevent any military conflict between the two countries. No military forces or installations are allowed within the DMZ.

Another example is the Rhineland, which was demilitarized after World War I. This meant that Germany was not allowed to station any military forces or install any military installations in the Rhineland.

These examples illustrate the definition of a demilitarized zone because they both show areas where military forces and installations are not allowed. This helps to prevent military conflict and maintain peace between countries.