TXT is a DNS record, that contains info in human-readable form for external sources to gain information regarding a certain domain or subdomain. In the most common scenario, this type of record is used to prove that you own a domain if you're trying to add it to a search engine or to some web traffic analytics platform. Considering that only the domain owner/administrator is able to add custom DNS records, the TXT record works as a proof of ownership for the company offering the service. Another popular use for this type of records is the e-mail SPF (Sender Policy Framework) protection, that makes sure that an e-mail address will not be spoofed and that others will not get junk mail from allegedly your mailbox. The TXT record contains info about the mail server where your online messages originate from and functions as validation that it's a dependable one. Because there are no rules about the content of this type of a record, you could add any other information also.