Websites and hosting
DNS
The system that turns a domain name into the address of the server it points at, for websites, email and everything else.
What dNS means in practice
DNS is the switchboard for a domain. One set of records decides which server answers for the website, another decides where email is delivered, and others prove that mail claiming to come from your domain is genuinely yours. They are independent, which is why a website can move hosts without email moving.
It matters because DNS is where a small mistake becomes a total outage, and because control of it is control of the domain. Knowing which account holds your DNS, and having access to it yourself rather than through whoever built the site five years ago, is one of the more valuable pieces of admin a business can sort out on a quiet afternoon.
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