Definition
DNS is a distributed phonebook for the internet. When you visit a URL, a resolver queries hierarchical name servers to find the IP address of the hosting server.
DNS records (A, CNAME, MX, TXT) configure websites, email, and verification.
In simple terms
DNS is contact search on your phone — you type a name; the system finds the number to dial.
Where you see it
- Registering goobolabs.so points DNS to your hosting provider.
- Email deliverability uses MX records.
- Certificate issuance uses TXT records.
How it works
1.Query
Browser asks resolver for domain IP.
2.Recursive lookup
Root → TLD → authoritative name server.
3.Cache
TTL controls how long answers are stored.
Why it matters
- DNS misconfiguration breaks sites and email — essential for deploying any web or AI service.
Often confused
DNS changes are instant worldwide.
Propagation can take minutes to hours depending on TTL and caches.