What is a demilitarized zone (DMZ) and why is it used in firewall architecture?

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What is a demilitarized zone (DMZ) and why is it used in firewall architecture?

A demilitarized zone (DMZ) is a network segment that is placed between an internal network and an external network, typically the internet. It is used in firewall architecture to provide an additional layer of security by separating the internal network from the external network. The DMZ acts as a buffer zone, allowing limited access to certain resources or services from the external network while keeping the internal network protected. It is commonly used to host public-facing servers or services, such as web servers or email servers, that need to be accessible from the internet while minimizing the risk of direct access to the internal network.