TXT is a DNS record, that contains data in human-readable form for external sources to gain info about a specific domain name or subdomain. In the most common case, this sort of record is employed to prove that you own a domain name in case you're trying to add it to an online search engine or to some web traffic analytics platform. As only the domain name owner/administrator is able to add custom DNS records, the TXT record serves as a verification of ownership for the firm offering the service. Another popular use for this sort of records is the e-mail SPF (Sender Policy Framework) security, which makes sure that a particular email address shall not be spoofed and that people will not receive junk e-mail from allegedly your mailbox. The TXT record includes info about the mail server where your digital messages arrive from and functions as validation that it's a reliable one. Since there are no standards about the content of this type of a record, you can add any other information as well.