The Domain Name System, or DNS, is a core component of the internet infrastructure. It is often described as the phonebook of the internet, as it translates human-readable domain names (such as www.example.com) into IP addresses (such as that computers use to identify each other on the network.

Here are the key concepts and functions of DNS:

In summary, DNS is a critical component of the internet, enabling users to connect to websites and online services using easily memorable domain names instead of numerical IP addresses. DNS servers, hierarchically organized and employing caching mechanisms, efficiently manage and resolve domain name queries while implementing security measures to maintain the integrity and safety of the internet infrastructure.