A TXT record is text in free, human-readable form, that's associated with a domain as a DNS record for one purpose or other. The most frequent use of a TXT record is to add your site to an online search engine or to an analytics platform, which provides details about the web traffic to your site. Setting up such a record works as verification that you are the Internet domain owner and they'll provide the content you should include as the value when you set up the record. Another use of a TXT record is to validate that an email message is sent by the domain address owner and from a reliable server - this is the so-called SPF security, that prevents any electronic address created under your domain to be forged and unauthorized people to send junk e-mail making it look like it was mailed from your own mailbox. You could include any other info that you'd like to be associated with your domain name in a TXT record as well.