A wireless repeater is a device that extends the range of a wireless network by receiving and amplifying the signal. It works by capturing the existing Wi-Fi signal from a router and retransmitting it, allowing devices that are farther away to connect to the network. This is especially useful in large homes or offices where the original signal may not reach all areas. By placing a wireless repeater in a strategic location, users can improve connectivity in dead zones or areas with weak signals. This device is commonly used in conjunction with Wi-Fi routers to enhance overall network performance and ensure a stable internet connection throughout a space.