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DNS | Glossary | Sitecheck

DNS (Domain Name System) is the address book of the internet. It resolves names like example.com to addresses and provides other records (MX, TXT, CAA) that affect email, security, and delivery.

Common records:

A / AAAA: IP addresses
CNAME: alias records
MX: mail exchange
TXT: arbitrary text (SPF/DKIM/DMARC)

Keeping DNS correct ensures email deliverability, security, and availability.