> For the complete documentation index, see [llms.txt](https://wiki.songer.pro/interviewing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.songer.pro/interviewing/security-domains-and-technical-aptitude/network-security/dns/what-is-dns.md).

# What is DNS?

DNS (Domain Name System) is an Internet service that translates domain names into IP addresses. DNS essentially serves as the Internet's phone book, keeping a log of domain names and matching them to corresponding IP addresses. DNS allows users to type in easy to remember domain names instead of a series of numbers to access websites and other Internet services.