TXT is a DNS record, which contains data in human-readable form for external sources to get info about a particular Internet domain or subdomain. In the most common situation, this kind of record is used to prove that you own a domain name in case you're trying to add it to a search engine or to some traffic analytics platform. Due to the fact that only the domain owner/administrator is able to add custom DNS records, the TXT record works as a proof of ownership for the corporation providing the service. Another popular use for this sort of records is the e-mail SPF (Sender Policy Framework) protection, that ensures that a particular email address isn’t spoofed and that others will not get spam from allegedly your mailbox. The TXT record contains information about the mail server where your online messages arrive from and serves as verification that it's a reliable one. As there are no rules regarding the content of this kind of a record, you could add any other info also.