What are TXT records?
TXT records or Text records are custom records that comprise of textual data, readable by human beings.
Dynamic TXT records find usage for a number of purposes like domain ownership verification for different services like Google Apps.
An example of a TXT record, used for SPF verification, might be:
v=spf1 ip4:18.104.22.168 ip6:2a05:d018:e3:8c00:bb71:dea8:8b83:851e include:thirdpartydomain.com -all