Chances are, a range extender will get the job done. Well, hang on before you do that, because for well under $100 in most cases you have another option. Most folks figure they need to upgrade their Wi-Fi in that situation, so they either buy a new Wi-Fi router or upgrade their internet service (or both). The same goes for many consumer-grade apps, especially video streaming services like Netflix, and certainly the latest games. When they don't get it, that chat you're having with your boss on your company's voice over IP (VoIP) phone system suddenly sounds like one of you is underwater. And some of these require not only a good amount of bandwidth, but a steady amount of bandwidth.
With so many of us working from home these days, we now have more apps than ever careening across our household Wi-Fi networks.