TXT is a DNS record, which contains data in human-readable form for external sources to get info about a specific domain name or subdomain. In the most common situation, such a record is used to prove that you own a domain name in case you're trying to add it to an online search engine or to some web traffic analytics platform. Since only the domain name owner/administrator can add custom DNS records, the TXT record serves as a verification of ownership for the corporation providing the service. Another popular use for this kind of records is the email SPF (Sender Policy Framework) protection, that ensures that a particular email address won't be spoofed and that individuals will not receive unsolicited mail from allegedly your mailbox. The TXT record features information about the mail server where your digital messages arrive from and serves as proof that it's a reliable one. As there are no regulations concerning the content of such a record, you could also include any other information as well.