TXT is a DNS record, containing information in human-readable form for external sources to obtain information about a certain domain name or subdomain. In the most common case, this kind of record is employed to prove that you own a domain name in case you are trying to add it to an Internet search engine or to some traffic analytics platform. Since just the domain name owner/administrator can add custom DNS records, the TXT record functions as a proof of ownership for the company providing the service. Another popular use for this kind of records is the e-mail SPF (Sender Policy Framework) protection, that helps to ensure that a particular email address shall not be spoofed and that people will not get junk mail from allegedly your mailbox. The TXT record includes info about the mail server where your online messages originate from and functions as proof that it's a trusted one. Since there are no restrictions about the content of this sort of a record, you could add any other info as well.