Computer Network
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What is DNS?
Simple explanation of DNS and how it works.
🌐 What is DNS?
DNS (Domain Name System) is like the phonebook of the internet.
It converts domain names (like google.com) into IP addresses (like 142.250.183.14), so computers can find each other.
🧠 Why We Need DNS
Before DNS, people had to remember IPs — which was hard!
DNS made it easy by letting us use simple names instead of numbers.
⚙️ How DNS Works
- You type
google.com. - Browser asks DNS for the IP.
- DNS finds and returns it.
- Browser connects to that IP — and the website loads 🚀.
📦 Common DNS Record Types
| Type | Purpose | Example |
|---|---|---|
| A | Domain → IPv4 | example.com → 192.168.1.1 |
| AAAA | Domain → IPv6 | example.com → 2401:4900::10 |
| CNAME | Alias | www → example.com |
| MX | Email routing | Sends mail to Gmail, etc. |
🧭 Why DNS is Important
- Easy to remember names
- Flexible when IPs change
- Keeps the internet fast and simple 🌍
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