> For the complete documentation index, see [llms.txt](https://dianadarie.gitbook.io/system-design-notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dianadarie.gitbook.io/system-design-notes/basics/dns.md).

# DNS

The **domain name system (DNS)** is the Internet’s naming service that maps human-friendly domain names to machine-readable IP addresses. The service of DNS is transparent to users. When a user enters a domain name in the browser, the browser has to translate the domain name to IP address by asking the DNS infrastructure. Once the desired IP address is obtained, the user’s request is forwarded to the destination web server.

<figure><img src="https://2798622988-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSvyZbTXexnOjgYP5Qq4a%2Fuploads%2F1laYsnZWEs1uOVbPfFvg%2FDiana%20Playground%20(14).jpg?alt=media&amp;token=65e49aa8-4f6a-4308-9479-5fe35ceb665e" alt=""><figcaption></figcaption></figure>