What Is DNS? | Marketing Dictionary
DICTIONARY · WEB

What is DNS?

The system translating domain names into network addresses.

In plain English

DNS is the directory of the internet. Someone types your domain, DNS looks up which server it points to, and the browser goes there. Without it you would be typing IP addresses.

Marketers meet DNS in three moments. Moving hosts, setting up email authentication, and verifying a domain for a platform. All three involve editing records, and all three are easy to get wrong.

What to know

Records point things at places
An A record points a domain at a server address. CNAME aliases one name to another. MX routes email. TXT records hold verification and email authentication values.
Propagation is caching, not travel
Changes are cached with a time-to-live value. Until caches expire, some people see the old destination. Lowering the TTL before a planned move shortens the wait.
Email authentication lives here
SPF, DKIM and DMARC are DNS records. Deliverability problems are frequently DNS problems.
One mistake takes everything down
Deleting or mistyping a record can take down the site or email instantly. Record what you change before you change it.

Why it matters

DNS is invisible until it breaks, and when it breaks it breaks everything at once. Any migration, email setup or platform verification runs through it, so knowing what the records do turns a frightening task into a routine one.

Common mistakes

×Editing records without noting the previous values.
×Migrating hosts without lowering the TTL first, then waiting a day for the switch.
×Adding a second SPF record instead of merging into the existing one.
×Assuming a site is broken during propagation and changing more things.

FAQs

How long do DNS changes take?

Usually minutes to a few hours, up to 48 in the worst case, depending on the TTL and intermediate caches.

Should my domain registrar handle DNS or my host?

Either works. Pick one and keep it consistent, because DNS split across two providers is a reliable source of confusion.

WRITTEN BY TARIQ SALLAM
Marketing Consultant. Entrepreneur. Content Creator.

I'm a marketing consultant, entrepreneur and content creator. I help businesses grow through practical marketing, websites, SEO, content and AI.

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