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DNS: definition

DNS (Domain Name System) is the system that translates a domain name into an IP address, so the browser knows which server to contact to display a site.

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Why DNS directly concerns an online seller

Every domain name is tied to DNS records: an A record points to an IP address, a CNAME redirects a subdomain to another name, and an MX record indicates which server receives the domain's e-mails. A mistake in these settings is enough to make a shop unreachable or cut off order e-mails, even if the site itself works perfectly.

These settings are changed in the DNS zone, managed at the registrar (where the domain was bought) or at the host. After a change, it doesn't take effect everywhere instantly: DNS propagation can take anywhere from a few minutes to about 48 hours depending on the configured TTL, which explains why a site can look "half-migrated" after a change of host.

Frequently asked questions

Why does my site still show the old version after a change of host?
The browser or internet provider keeps the old IP address cached until the TTL expires. Usually, waiting for propagation is enough.
Does DNS affect the receipt of order e-mails?
Yes, indirectly: if the MX record is misconfigured, transactional e-mails may never arrive, even though the shop otherwise works normally.
Do you need to touch DNS to install an SSL certificate?
Not always, but some validation methods require adding a temporary TXT record to the DNS zone before the certificate is issued.

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