Wi-Fi
About 5 min read
Last updated: 2026-08-14
What Is Wi-Fi
Wi-Fi is a brand name for wireless LAN communication standards. Based on the IEEE 802.11 specification, it connects smartphones, PCs, tablets, and other devices to the internet through a router. Because it requires no cables, Wi-Fi is used everywhere from homes and offices to cafes and public spaces.
Wi-Fi Standards and Encryption
Public Wi-Fi Risks
Free Wi-Fi at cafes and stations is convenient, but comes with these risks:
- Eavesdropping: On unencrypted Wi-Fi, others on the same network can potentially see your traffic
- Fake access points: Attackers set up Wi-Fi networks with names similar to legitimate ones to intercept connected users' traffic
- Man-in-the-middle attacks: Intercepting and potentially altering data in transit
Tips for Using Wi-Fi Safely
Home Wi-Fi: Encrypt with WPA3 or WPA2. Set a strong password. Keep your router firmware up to date.
Public Wi-Fi: Use a VPN to encrypt your traffic. Avoid sensitive operations like logging in or making payments. Turn off auto-connect.
For more on this topic, see our Public Wi-Fi Risks and How to Stay Safe.
Common Misconceptions
- Password-protected Wi-Fi is always safe
- Public Wi-Fi passwords are shared with everyone, which diminishes the protection of encryption. It is fundamentally different from a home Wi-Fi network protected by a personal password.
- Wi-Fi signals are harmful to health
- Wi-Fi signals are extremely weak, and the WHO has stated that no adverse health effects have been confirmed as of 2026.
Home Wi-Fi vs. Public Wi-Fi
Home Wi-Fi
Protected by a personal password. Traffic is encrypted and security is high.
Public Wi-Fi
Shared password or no password. Risk of eavesdropping and fake access points.