DNS, or Domain Name System, is a hierarchical decentralized naming system for computers, services, or other resources connected to the internet or a private network. It associates various information with domain names assigned to each of the associated devices, such as the physical location of the device (e.g. IP address), but also used for the widely implemented yet specialized DNS applications, such as mail exchangers (MX records), and additional types used for the user datagram protocol (UDP) based domain name system (DNS) which has been in use since 1983.
DNS is an essential part of the internet, as it allows us to access websites and other online resources by using easy-to-remember domain names instead of having to remember the numerical IP addresses of each website. Checking your DNS address can be important for troubleshooting connection issues, improving website performance, or enhancing online security.