🌐 How a Message Travels Across the Internet

What happens when you send a photo? Today we follow a message step by step on its journey across the internet.

The internet is not one giant computer. It is a network of networks: millions of small networks around the world joined together.

When you ask your browser for a web page, your device is the client. The computer that stores the page and sends it to you is the server. The client asks, the server serves.

Every device on a network has an IP address, like the postal address of a house. An IPv4 address is four numbers separated by dots, and each number is between 0 and 255. Data reaches the right device thanks to this number.

You type a name like school.example.org. Computers talk in numbers. DNS (the Domain Name System) turns the name into an IP address, just like a phone book.

A big photo does not travel in one piece. It is cut into small data packets. Each packet carries the receiver’s address and a sequence number.

Packets travel through routers. A router decides which road each packet takes. Packets can take different roads and arrive in a mixed-up order.

The receiving device puts the packets in order by their sequence numbers and rebuilds the photo. Arriving mixed up is no problem.

Summary: the internet is a network of networks. The client asks, the server serves. An IP is a device’s address, and DNS turns a name into an IP. Data is cut into packets and routers choose the roads. Now try it in Ağ Dedektifi!