Zigbee is a wireless networking standard for low-power, low-data-rate devices such as light bulbs, switches, thermostats, door sensors, and other small smart-home and building-automation hardware. Its defining trait is mesh networking: rather than every device talking directly to a central hub, devices relay messages for one another, so a signal can hop across a building through intermediate nodes. The standard is developed and maintained by the Connectivity Standards Alliance (CSA), the organization formerly known as the Zigbee Alliance.
The CSA describes Zigbee as “the only complete IoT solution, from mesh network to the universal language that allows smart objects to work together,” emphasizing that it specifies not just the radio but the application-layer behavior that lets devices from different makers interoperate. The mesh itself is characterized as a “self-organizing, self-healing mesh topology” that “scales to thousands of nodes.” Self-healing means that if one relay node fails or is removed, the network automatically reroutes traffic around it, eliminating single points of failure.
Power efficiency is central to the design. The CSA notes that Zigbee products are “optimized for low power consumption to extend battery life,” which is what allows a door or motion sensor to run for years on a coin cell. The trade-off is bandwidth: Zigbee carries small, infrequent messages rather than streaming media, which is exactly the profile of most sensor and control traffic. Beneath the Zigbee application and network layers sits the IEEE 802.15.4 standard, which defines the underlying low-rate wireless physical and media-access layers that Zigbee builds upon.
Interoperability is enforced through certification. The CSA runs certification programs, developer resources, and testing facilities so that products carrying the Zigbee logo will work together, with member companies including Amazon, Google, Samsung, and Philips (whose Hue lighting is a widely deployed Zigbee product). The Alliance reports that more than a billion Zigbee chipsets have shipped, making it one of the most widely deployed home-automation radios.
Zigbee occupies a distinct niche in the IoT radio landscape. Where Wi-Fi offers high bandwidth at high power cost, and where LoRaWAN trades bandwidth for very long range, Zigbee targets short-range, dense, battery-powered mesh networks inside a home or building. Its long life and the rise of the CSA’s newer Matter standard, which can run over Zigbee-style 802.15.4 radios via Thread, have kept it central to the connected-home story.