Domain Name System

DNS is the phone book of the internet. Whenever you type a domain name into your browsers address field, the browser asks DNS what computer it should contact in order to get the website, you've requested.

DNS is short for Domain Name System. Every domain name in the world has a set of DNS records, which are stored in a DNS server somewhere. Each record has a few parts:

In the above case, whenever your browser looks up `www.emailsherpa.net` in DNS, it'll get an "A record" with the value `` (for example). It'll then ask that server at for a website named `www.emailsherpa.net`.

DNS record can also store other values, like arbitrary text data in `TXT` records. This is used heavily when setting up DMARC.