TXT is a DNS record, that contains info in human-readable form for external sources to get info about a specific domain name or subdomain. In the most common case, such a record is used to prove that you own a domain name if you're trying to add it to an Internet search engine or to some website traffic analytics platform. As only the domain owner/administrator may add custom DNS records, the TXT record serves as a verification of ownership for the company offering the service. Another popular use for this type of records is the email SPF (Sender Policy Framework) protection, that helps to ensure that a particular email address shall not be spoofed and that others will not get unsolicited mail from allegedly your mailbox. The TXT record contains info about the mail server where your online messages come from and serves as confirmation that it's a reliable one. Because there are no standards regarding the content of this sort of a record, you can add any other information as well.