Definition
TXT records store arbitrary text strings in DNS. Originally for human-readable information, they're now widely used for machine-readable data: SPF records (v=spf1...), DMARC records (v=DMARC1...), domain verification tokens (google-site-verification=...), and DKIM public keys. A domain can have multiple TXT records. Maximum length per string is 255 characters; multiple strings can be concatenated.
Use the tool: DNS Lookup — check txt record for any domain.