Wi-Fi vs Ethernet: what is the difference?
In short: Wi-Fi connects devices by radio, so you can move around freely, but walls, distance and other networks weaken it. Ethernet uses a network cable, which gives a faster, steadier and more private connection for devices that stay in one place.
Wi-Fi vs Ethernet in one sentence
Wi-Fi carries your data by radio waves through the air, while Ethernet carries it along a physical cable plugged into the router or a switch.
Side-by-side comparison
| Feature | Wi-Fi | Ethernet |
|---|---|---|
| Connection | Radio, no cable | Network cable (often called a LAN cable) |
| Speed in practice | Good, but drops with distance and walls | Usually the full speed of your line |
| Stability | Can vary; affected by interference | Very steady |
| Delay (ping) | Slightly higher and less even | Low and consistent |
| Freedom to move | Anywhere in range | Only where a cable reaches |
| Security | Protected by the Wi-Fi password and encryption | Someone needs physical access to plug in |
| Best for | Phones, tablets, laptops on the move | TVs, desktops, consoles, work computers |
What is Wi-Fi?
Wi-Fi uses radio, much like a walkie-talkie, to link your devices to the router. It is what makes phones and laptops so convenient: you can work from the sofa or the garden. The trade-off is that radio signals weaken as they pass through walls and floors, and they share the air with your neighbours' networks, microwaves and other gadgets. Our guide How Wi-Fi works explains the bands and why range varies.
Wi-Fi is protected by encryption. Use WPA2 or, better, WPA3 with a long password so nobody nearby can join or listen in.
What is Ethernet?
Ethernet is the standard for wired networks. A cable with a chunky plug, a bit like a large phone plug, connects a device to a port on the router or a switch. Because the signal travels along copper wires inside the cable, it is not affected by walls or neighbours. A good cable can carry very high speeds over long distances inside a building.
Many laptops no longer have an Ethernet port, but a small USB adapter adds one. Desktop PCs, smart TVs and games consoles usually have one built in.
Which one should you use?
Use Ethernet for devices that stay put and need a smooth connection: a TV that streams in 4K, a games console, a work-from-home desktop or anything used for video calls all day. Use Wi-Fi for everything that moves. Most homes use both: cables for the few big users near the router, Wi-Fi for the rest. If running cables is hard, powerline adapters (which use your home's electrical wiring) or a mesh Wi-Fi system are good in-between options.
Common mistakes and myths
- "Wi-Fi is the internet." Wi-Fi is only the link between your device and the router; the internet connection comes in through the router.
- "Ethernet is outdated." It is still the backbone of every office, data centre and school network.
- Using a very old, damaged or flat cheap cable can limit speed. Use at least Cat 5e, ideally Cat 6.
- "A faster broadband plan will fix slow Wi-Fi." If the problem is coverage, a faster plan changes nothing.
Learn more
Key takeaways
- Wi-Fi uses radio and gives freedom to move; Ethernet uses a cable and gives steadier speed.
- Walls, distance and interference weaken Wi-Fi but not Ethernet.
- Plug fixed, heavy users into Ethernet and keep Wi-Fi for mobile devices.
- Protect Wi-Fi with WPA2 or WPA3 and a long password.
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