Web, domains and email
CAA
Abbreviation for Certification Authority Authorization
In short and in plain language
CAA is a record for a domain in the address book of the internet.
In it, the owner says: these bodies may give out certificates for the domain. This can help to limit unwanted ones, or ones made by mistake.
If you change your provider, the record should match the new one. If not, getting a certificate can fail.
Definition
CAA is a record type in the Domain Name System that lets a domain owner specify which certification authorities may issue certificates for it. It can help limit unauthorised or accidental issuance. When changing certificate provider, the record should match the new provider, otherwise issuance can fail.