Internet & Identity · lesson 1 of 17 · 15 min
The internet is a giant postal system
Have you ever passed a note to a friend in class? Computers do something very similar — except instead of paper, they send tiny bundles of information called data packets. These packets travel through cables underground, through the air as Wi-Fi signals, and even through satellites in space!
Every computer, phone, and tablet that connects to the internet gets a special number called an IP address. Think of it exactly like your home address — it tells other computers exactly where to send information. Without an address, your computer would be like a house with no street number: nobody could find it.
🌍 Cool fact: Right now, there are over 5 billion devices connected to the internet around the world. Every single one has its own IP address so they can find each other!
What is a data packet?
Imagine you want to send a big poster to a friend who lives far away. The poster is too big to fit in one envelope, so you cut it into 10 pieces, put each piece in its own envelope, and mail them all separately. Your friend gets all 10 envelopes and puts the poster back together.
That is exactly how data packets work! When you watch a video or load a website, the information is cut into thousands of tiny packets. Each packet travels across the internet and arrives at your device, where your computer puts them all back together — usually in less than one second!
Each data packet contains:
- Where it came from
- The sender’s IP address
- Where it’s going
- The receiver’s IP address
- The actual data
- A small piece of the message or file
Servers — the helpers of the internet
When you type a website address into your browser, your computer does not already have that website stored on it. Instead, it sends a request — like raising your hand in class — to a special computer called a server.
A server is a powerful computer that stores websites, videos, and other information and sends them to anyone who asks. Big websites like YouTube have thousands of servers working together so millions of people can watch videos at the same time.
Try it yourself: Next time you open a website, notice how fast it loads. Your computer just sent a request across the internet, a server found the page, and sent it all the way back to you — in the time it takes to blink!
Key words to remember
- IP address
- Data packet
- Server
- Internet
- Wi-Fi
Match each word to its meaning
How computers talk — quiz
What is an IP address?
- A type of password
- A unique number that identifies a device on the internet
- A kind of computer game
- A website name
Answer: A unique number that identifies a device on the internet
Every device on the internet has an IP address — just like every house has a street address.
What are data packets?
- Boxes of computer parts
- Small bundles of information that travel across the internet
- Computer passwords
- Types of Wi-Fi signals
Answer: Small bundles of information that travel across the internet
Data packets are tiny pieces of information. Big files are split into many packets that travel separately and are put back together.
What does a server do?
- It plays games for you
- It stores websites and sends them to people who ask
- It blocks bad websites
- It creates passwords
Answer: It stores websites and sends them to people who ask
Servers are powerful computers that store websites and information and send them to anyone who requests them.
Every device on the internet has its own IP address.
- True
- False
Answer: True
True! Every device — computer, phone, tablet — gets its own IP address so other devices can find it.
When you load a website, what happens first?
- The website appears from inside your computer
- Your computer sends a request to a server
- You have to download the whole internet
- Nothing — it just appears by magic
Answer: Your computer sends a request to a server
Your computer sends a request to a server. The server finds the page and sends it back to you.
Why are big files split into data packets?
- To make them harder to find
- Because the internet can only carry small pieces at a time
- To make them travel faster and more reliably
- Because computers cannot read big files
Answer: To make them travel faster and more reliably
Splitting files into packets means each piece can take the fastest route and arrive quickly. Missing packets can be re-sent without resending the whole file.
What is Wi-Fi?
- A type of computer virus
- A way to connect to the internet using radio waves
- A kind of password
- A type of server
Answer: A way to connect to the internet using radio waves
Wi-Fi uses invisible radio waves to connect your device to the internet without cables.
A server is just a regular laptop computer.
- True
- False
Answer: False
Servers are powerful computers designed to store lots of information and handle requests from many people at the same time.
What is the internet?
- A single giant computer
- A type of Wi-Fi signal
- A giant network of billions of connected computers
- A website
Answer: A giant network of billions of connected computers
The internet is a massive network connecting billions of devices around the world.
How does your computer know where to send information?
- It guesses
- It uses IP addresses
- It uses your name
- It uses your school name
Answer: It uses IP addresses
IP addresses are like home addresses for computers — they tell the internet exactly where to deliver information.
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Next lesson: What is a website?