One of the main differences between a WiFi repeater and a WiFi extender is that a repeater will simply amplify the existing signal while an extender will also create a new WiFi network. This means that if you have a poor signal in your home, a repeater will likely not improve your situation much. However, an extender can create an entirely new network which may be stronger and provide better coverage. Another key difference is that repeaters typically only support one device at a time while extenders can support multiple devices simultaneously.