What this DNS lookup queries
The tool asks public recursive resolvers for the record types that matter in day-to-day operations: A and AAAA for IPv4 and IPv6 addresses, NS for the authoritative nameservers, MX for mail routing, TXT for SPF, domain verification and similar data, CAA for certificate authority restrictions, SOA for zone metadata and CNAME for aliases.
Each answer is shown with its TTL and the resolver that returned it. If a record type does not exist, the result says so explicitly, because the absence of a record is often the answer you were looking for.