The ‘start of authority’ record can store important info about the domain.
SOA record is a DNS Resource Record as a kind of documentary record.
It contains the admin email address of the person responsible and a few other values such as serial number, refresh, retries, expiry, etc.
Example of an SOA record:
The value here represents an email address, which can be confusing because it’s missing the ‘@’ sign, but in an SOA record, admin.example.com is the equivalent of email@example.com.