A Wi-Fi extender does just what its name tells you: it extends your Wi-Fi signal. If you live or work in an immense space, one with multiple floors or one with thick walls or other obstructions, a Wi-Fi extender will spread out your Wi-Fi signal throughout the space.
These devices connect wirelessly to the router and expand the Wi-Fi signal to areas the router doesn't reach. You might have to go through some trial and error on physical placement before settling.
Before you purchase one, make sure that there's not another solution, such as repositioning your router to a more central location, upgrading to a new one, or switching to a mesh network.
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How Wi-Fi Extenders Work
Wi-Fi extenders come in two form factors: small devices that plug into a wall outlet and larger desktop devices that often include ethernet ports. Both types expand your router's coverage area.
Once you've set an extender up, you'll have two networks from which to choose (the router's and the extender's) on two bands (2.4 GHz and 5GHz). You'll have to manually connect your device to the extender the first time.
Once you save it, you can easily switch between the router and the extender network, depending on which one is stronger at a given time. The default network name and password for a Wi-Fi extender depends on the manufacturer.
Do You Need a Wi-Fi Extender?
If you own your router, check if it's worthwhile to upgrade it; if you rent one from your ISP, contact them to see if you can get a free upgrade. Sometimes a new router is all you need to solve your wireless woes. If your current router is good enough, you'll want to purchase an extender with similar specs.
You don't want an extender that's less advanced than your router, and getting one that is more advanced means you'll be paying for functionality you can't use.The 9 Best Wi-Fi Extenders of 2021
Alternatives to Wi-Fi Extenders
There are many reasons you might have a weak or non-existent Wi-Fi signal in your space, and not all require a Wi-Fi extender.9 Ways to Boost Wi-Fi Signal Strength and Range
Other solutions include:Upgrading your router. Compare the specs of your current router with the latest models to find out if it's outdated. Our roundup of the best routers is an excellent place to start.Relocating your router. Try to position your router in a central location so that you can benefit from 360-degree coverage; contact your ISP if you need a new ethernet portConsider switching to a mesh network. Mesh networks consist of multiple nodes. One connects to your modem and the rest daisy chain throughout the rest of the space. It's especially convenient for an area larger than 1500 square feet with multiple floors.