A TP-Link Wi-Fi Range extender repeats the signal from your existing Wi-Fi router, it then amplifies this signal so that your Wi-Fi signal reaches much further than it can with the router alone. A TP-Link powerline adapter connects to your router and plugs into a standard electrical socket. Powerline Technology allows data to travel along your existing home (copper) wiring. Powerline Adapters come in different variations, some can even provide a Wi-Fi network as well as one or multiple ethernet connections.