A Wi-Fi repeater is a device that extends the coverage area of a wireless network. It receives the existing Wi-Fi signal from a router and amplifies it, allowing users to connect to the internet from farther away. This is especially useful in large homes or buildings where the signal may be weak in certain areas. By placing a Wi-Fi repeater in a location where the signal is still strong, it can help eliminate dead zones and improve overall connectivity. Users can enjoy better internet access for activities like streaming, gaming, and browsing without interruptions.