Back to Glossary
What Is DNS (Domain Name System)?
Updated 18 September 2026
Quick Answer
DNS (Domain Name System) is the system that translates a domain name (like yourbusiness.co.uk) into the technical address needed to find and load the actual website, acting like the internet's phone book.
DNS vs. Domain Name — What's the Difference?
| DNS | Domain Name | |
|---|---|---|
| What it is | The lookup system connecting a domain to a server | The address itself that a visitor types |
Why It Matters
- Understanding DNS is essential the moment you need to connect a domain to a website platform — it's the step that actually makes your site go live at your domain.
- Getting DNS records wrong (or changing them carelessly) can accidentally break email that was working before, not just the website.
How It Works
- A visitor types your domain name into their browser.
- A DNS lookup translates that name into the technical address of the server hosting your website.
- The browser connects to that server and loads your site.
Key Takeaways
- DNS translates a domain name into the technical address needed to load a website.
- It's the step that actually connects a domain to a website platform.
- Changing DNS settings carelessly can accidentally break email as well as the website.
Frequently Asked Questions
Do I need to understand DNS to run a website?
Only at the point of connecting a domain to a platform or troubleshooting an issue — most day-to-day website management doesn't require touching DNS directly.
Why did my email stop working after I changed my DNS settings?
Changing nameservers can wipe out email-related DNS records (like MX records) unless they're re-added at the new location — a common and avoidable mistake.
How long do DNS changes take to work?
Often within a few hours, though it can take up to 24-48 hours to fully propagate everywhere.