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What it is: The Domain Name System (DNS) is the system that translates the friendly website names you type (like google.com) into the numerical IP addresses that computers use to find each other (like 142.251.42.206). It's the actual lookup process.
Simple Analogy: DNS is the phone book. You look up a name (e.g., "Jane's Pizza"), and it gives you the phone number you need to call to reach them.
Key Purpose: Finding the correct server. It answers the question: "Where is this website located?"

What it is: WHOIS is a protocol and a database that stores information about who registered a domain name. It's a directory of who owns what.
Simple Analogy: WHOIS is like the section in the phone book that lists who the phone number is registered to, their address, and when they registered it. It's about ownership and registration details.
Key Purpose: Identifying the domain owner. It answers the questions: "Who owns this website?", "When did they register it?", and "How can I contact them?"

Feature	DNS (Domain Name System)	WHOIS (Who Is)
Main Job	Finding an address. Translates a domain name to an IP address.	Finding an owner. Provides registration details for a domain.
Analogy	The phone book that gives you a number.	The listing that tells you who the number belongs to.
What it answers	"Where is google.com?"	"Who owns google.com?"
Information it gives	IP addresses, mail server info, etc.	Owner's name, contact info, registrar, registration & expiry dates.
When you use it	Every time you visit a website (your browser does this automatically).	When you need to investigate a domain, contact the owner, or check if a domain is available.

Let's say you want to visit example.com.

Your computer uses DNS: It's like your computer shouting, "Hey, everyone, what's the address for example.com?!" A DNS server answers back, "It's 93.184.216.34!" Your browser then uses that number to connect to the website.
You get curious and use WHOIS: You wonder, "Who actually owns example.com?" You go to a WHOIS lookup website (like whois.icann.org), type in the domain, and it tells you the registration company, when it was created, and when it will expire.

DNS is for computers to find websites. It's about location.
WHOIS is for people to find out about website owners. It's about ownership.

They work together to make the internet function, but they serve two completely different purposes.