Domain Name System (DNS)

The Domain Name System (DNS) is a critical internet service that translates human-readable domain names into IP addresses and supports reverse lookups when needed.

DNS allows users and applications to reach websites, services, and resources without needing to remember long numerical addresses. It is a core part of the internet infrastructure and supports name resolution, service discovery, email routing, and security functions.

This section covers DNS hierarchy, query resolution, records, zones, security extensions, DNS privacy, and modern DNS protocols.