Home Networks & Wi-Fi · How Home Internet Works · Lesson 3 of 5

Wired or Wi-Fi?

Know when a cable beats Wi-Fi, and what powerline and mesh do.

Cable versus air

Your devices can reach the router in two ways: through the air with Wi-Fi, or through a cable.

An Ethernet cable is a network cable with a clear plastic plug, a bit wider than an old phone plug. One end goes into a free Ethernet port on your router. The other goes into the Ethernet port on your computer, TV or game console. Many thin laptops have no Ethernet port, but a small USB to Ethernet adapter adds one.

Wi-Fi is easy. You can move around, and phones and tablets only use Wi-Fi. But Wi-Fi gets weaker through walls and floors. Neighbors' Wi-Fi, microwaves and many devices sharing the air can slow it down too.

A cable has none of those problems. It gives steadier speed and a lower ping, almost no matter how busy the house is.

Wired is the better choice for:

• Gaming, where a steady, low ping matters most.
• Work video calls, so your picture and voice don't freeze.
• Smart TVs and streaming boxes near the router, for smooth 4K.
• Desktop computers that never move.

Everything else, like phones and laptops on the couch, is fine on Wi-Fi. A cable also frees up Wi-Fi for the devices that need it.

To check how you are connected on Windows 11, open Settings and choose Network & internet. It shows Ethernet when a cable is working. On a Mac, open System Settings and click Network.

Powerline and mesh

Sometimes the router is far from where you need the internet, and running a long cable isn't practical. Two common tools can help.

Powerline adapters send your network through the electrical wires already inside your walls. You plug one adapter into an outlet near the router and connect it with an Ethernet cable. You plug a second adapter into an outlet in another room and connect your TV or computer to it. They work best plugged straight into the wall, not into a power strip or surge protector. Results depend on your home's wiring, so speed can vary from room to room.

A mesh Wi-Fi system is a set of two or more Wi-Fi units that work together as one network. One connects to your modem. The others sit around the house, about halfway to the rooms with weak signal. Your devices see one Wi-Fi name and move between units on their own as you walk around. Mesh is built for covering a whole large or multistory home.

You may also see Wi-Fi extenders, single plug-in boxes that repeat your signal. They are cheap and can help one room, but often cut speed, and some create a second network name.

Before buying anything, try moving the router. A router in a central, open spot often fixes weak rooms for free. Later courses show how.