TXT is a DNS record, containing info in human-readable form for external sources to obtain information about a specific domain name or subdomain. In the most common scenario, this kind of record is used to prove that you own a domain name if you're trying to add it to a search engine or to some traffic analytics platform. As just the domain address owner/administrator can add custom DNS records, the TXT record works as a verification of ownership for the business supplying the service. Another popular use for this kind of records is the e-mail SPF (Sender Policy Framework) security, that ensures that an e-mail address will not be spoofed and that individuals will not receive unsolicited mail from allegedly your mailbox. The TXT record includes details about the mail server where your online messages come from and serves as verification that it is a reliable one. Because there are no regulations about the content of this kind of a record, you could add any other info as well.