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If you have a large house, your router may not be able to beam its signal to every corner of every room. That’s where a Wi-Fi range extender comes in. As its name suggests, it boosts your Wi-Fi signal further than your router alone can handle.
Traditionally, Wi-Fi extenders have been, well, terrible. Many required you to create a new network with a different SSID otherwise your devices would have trouble knowing which one to connect to. In addition, most cheaper extenders will cut your Wi-Fi speed in half just by virtue of how they repeat the signal—not great if you want a constant, reliable connection.
Source: IGN.com The Best Wi-Fi Range Extenders