Glue Record
A glue record is a special [[a-record|A record]] or [[aaaa-record|AAAA record]] stored in the parent zone (e.g., .com) that provides the IP address for a [[nameserver]] within the same domain it serves, preventing circular DNS dependencies.
Example
If ns1.example.com is a nameserver for example.com, the .com zone needs a glue record mapping ns1.example.com to an IP address.