TXT is a DNS record, which contains info in human-readable form for external sources to get information regarding a certain domain name or subdomain. In the most common case, this type of record is used to prove that you own a domain name if you are trying to add it to an Internet search engine or to some website traffic analytics platform. As only the Internet domain owner/administrator may add custom DNS records, the TXT record functions as a proof of ownership for the company providing the service. Another popular use for this kind of records is the e-mail SPF (Sender Policy Framework) security, that ensures that an email address will not be spoofed and that others will not receive junk e-mail from allegedly your mailbox. The TXT record contains info about the mail server where your electronic messages arrive from and functions as proof that it's a dependable one. Because there are no rules regarding the content of this sort of a record, you could add any other info as well.
