TXT is a DNS record, which contains data in human-readable form for external sources to obtain information regarding a particular domain or subdomain. In the most common case, such a record is used to prove that you own a domain in case you're trying to add it to a search engine or to some website traffic analytics platform. Considering that just the domain name owner/administrator may add custom DNS records, the TXT record works as a verification of ownership for the corporation supplying the service. Another popular use for this kind of records is the e-mail SPF (Sender Policy Framework) protection, which makes sure that a particular email address shall not be spoofed and that people will not receive unsolicited mail from allegedly your mailbox. The TXT record includes details about the mail server where your electronic messages arrive from and functions as validation that it is a reliable one. As there are no standards regarding the content of this type of a record, you could add any other info as well.