It can be anything! An apex, subdomain, or even a URL.

Results forwww.gmail.com

Resolver

Location

A

Name	TTL	Value
www.gmail.com	300	2607:f8b0:4004:c09::11Google Public DNS (iad) / Google LLC
www.gmail.com	300	2607:f8b0:4004:c09::12Google Public DNS (iad) / Google LLC
www.gmail.com	300	2607:f8b0:4004:c09::13Google Public DNS (iad) / Google LLC
www.gmail.com	300	2607:f8b0:4004:c09::53Google Public DNS (iad) / Google LLC

Name	TTL	Value
www.gmail.com	86400	google-site-verification=PncXpRKRCAlDAdlesTtNFf6k9TvgxgcRfojdaKkEACY
www.gmail.com	86400	google-site-verification=gcbFUU2sXMUtwiwPBpJ6gGGLmq4JVJAT5htf2U_H7v8