A Power over Ethernet (PoE) extender is a device designed to amplify the reach of PoE networks beyond the standard 100-meter limit of Ethernet cables. By allowing both power and data to travel over a single cable, it enables the connection of devices like IP cameras and wireless access points in remote locations where power outlets are scarce. The extender boosts the signal and power, ensuring reliable performance without the need for additional wiring, making it an efficient solution for expanding network coverage in large spaces or challenging environments.