TXT is a DNS record, that contains info in human-readable form for external sources to gain info about a specific domain name or subdomain. In the most common case, this type of record is employed to prove that you own a domain name if you're trying to add it to an online search engine or to some website traffic analytics platform. Due to the fact that only the domain address owner/administrator can add custom DNS records, the TXT record functions as a proof of ownership for the company offering the service. Another popular use for this type of records is the e-mail SPF (Sender Policy Framework) security, that helps to ensure that a particular email address will not be spoofed and that others will not receive unsolicited mail from allegedly your mailbox. The TXT record contains information about the mail server where your online messages come from and functions as validation that it's a reliable one. As there are no regulations about the content of this kind of a record, you can include any other information as well.