Privacy, Devices & Citizenship · lesson 5 of 17 · 15 min
What is Wi-Fi?
Wi-Fi is a way for your device to connect to the internet without using a physical cable. It uses invisible radio waves — similar to how a radio picks up music from a station — to send and receive information through the air. These radio waves travel at very high speeds, which is why you can load a webpage or watch a video almost instantly.
A device called a router in your home or school creates the Wi-Fi signal. When your device connects to the router, it can access the internet. The router is connected to the internet through a cable from your internet service provider (ISP) — the company that provides your internet connection.
Wi-Fi is incredibly convenient, but not all Wi-Fi networks are equally safe. The security of a Wi-Fi connection depends on whether it is protected by a password and how strong that protection is.
Safe vs. unsafe Wi-Fi: Your home Wi-Fi is protected by a password — only people who know the password can use it. Public Wi-Fi (at a café, library, or airport) is open to everyone, which makes it much less safe. Avoid entering passwords or personal information on public Wi-Fi.
Home Wi-Fi vs. public Wi-Fi
🏠 Home Wi-Fi — safer
- Protected by a password
- Only trusted people in your home can connect
- Encrypted — data is scrambled so others cannot read it
- You control who has the password
☕ Public Wi-Fi — riskier
- Open to anyone — no password required
- Strangers on the same network could see your activity
- Avoid logging into accounts or entering personal information
- Fake “free Wi-Fi” hotspots can be set up by scammers
Wi-Fi safety tips
- Only connect to Wi-Fi networks you recognize and trust.
- Never share your home Wi-Fi password with people outside your family without a trusted adult’s permission.
- On public Wi-Fi, avoid logging into accounts or entering personal information.
- If a Wi-Fi network asks for personal information to connect, tell a trusted adult — this is a red flag.
- Look for the padlock icon in your browser — it means the website is using encryption to protect your data.
Key words to remember
- Wi-Fi
- Router
- Public Wi-Fi
- Encryption
- ISP
Match each Wi-Fi concept to its description
Wi-Fi safety — quiz
How does Wi-Fi connect your device to the internet?
- Through a cable plugged into your device
- Using invisible radio waves through the air
- By using your phone’s battery
- Through a satellite in space
Answer: Using invisible radio waves through the air
Wi-Fi uses radio waves to send and receive information wirelessly.
Why is public Wi-Fi less safe than your home Wi-Fi?
- It is slower
- It uses more battery
- Anyone can connect to it, not just trusted people
- It only works on phones
Answer: Anyone can connect to it, not just trusted people
Public Wi-Fi has no password, so anyone — including bad actors — can connect and potentially see your activity.
It is safe to enter your passwords on public Wi-Fi at a café.
- True
- False
Answer: False
Public Wi-Fi is not secure. Avoid entering passwords or personal information when connected to it.
What is a router?
- A type of computer virus
- A device that creates a Wi-Fi signal and connects devices to the internet
- A type of password
- A cable that connects to the internet
Answer: A device that creates a Wi-Fi signal and connects devices to the internet
A router creates the Wi-Fi signal in your home or school and connects your devices to the internet.
What should you do if a Wi-Fi network asks for personal information to connect?
- Enter your information — it is probably safe
- Tell a trusted adult — this is a red flag
- Connect anyway and ignore the request
- Share the network with friends
Answer: Tell a trusted adult — this is a red flag
Legitimate Wi-Fi networks do not ask for personal information to connect. This is a warning sign.
You should share your home Wi-Fi password with anyone who asks.
- True
- False
Answer: False
Only share your home Wi-Fi password with trusted people, and always ask a trusted adult first.
What does encryption do?
- Makes your internet faster
- Scrambles data so others cannot read it
- Connects you to more Wi-Fi networks
- Saves your passwords
Answer: Scrambles data so others cannot read it
Encryption scrambles your data so that only the intended recipient can read it — protecting your information.
What does the padlock icon in your browser mean?
- The website is blocked
- The website is using encryption to protect your data
- The website is slow
- The website requires a password
Answer: The website is using encryption to protect your data
The padlock icon means the website is using HTTPS encryption — your data is protected in transit.
Which of these is the safest Wi-Fi to use?
- Free public Wi-Fi at a café
- Your home Wi-Fi with a strong password
- A Wi-Fi network with no password
- Any Wi-Fi that is fast
Answer: Your home Wi-Fi with a strong password
Home Wi-Fi with a strong password is the safest — only trusted people can connect.
A scammer could set up a fake “free Wi-Fi” hotspot to steal your information.
- True
- False
Answer: True
Fake Wi-Fi hotspots are a real threat — always verify a network is legitimate before connecting.
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