DNS

DNS is the system that turns a domain name into the address of the machine that answers for it.

In a little more detail

It decides who receives requests for your site. When a site is unreachable for machines but fine in your browser, this is one of the few places to look.

Related terms

CDN: A CDN is a network of servers around the world that keeps copies of your site so visitors are served from somewhere close to them.
Edge: The edge is the layer that sits in front of your website and answers requests before they reach your own server.

See it on your own site

The scan reads your site the way AI search does and reports where you stand on this and sixteen other checks.