Without the Domain Name System (DNS) no one would be able to find your website or send you email, at least not easily. In its simplest form it maps human readable domain names to IP addresses (e.g. www.netgate.net -> 18.104.22.168). It’s fundamental to everything else you do on the Internet. For the fastest page load times, for the most reliable email, you want a distributed well managed DNS infrastructure hosting your domain names.