A "Bridge" like the one from "Philips Hue" or from other manufacturers is also called a "hub" or "gateway". With it, the devices in the "ZigBee network" can communicate. Since the radio protocol is not Internet-based, the lights can only be addressed via the "Bridge". It is the radio control center of the lighting system. It must be connected to the Internet via a router for configuration, updates and to be controlled via app with the smartphone or tablet. Switching on and off, dimming and changing the color of the lights does not require the Internet, as this is done in the "ZigBee network".