Which scenario best fits ZigBee usage?

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ZigBee is built for low-power, low-data-rate wireless networks that cover short distances and often include many battery-powered devices. This makes it ideal for small-scale setups like home automation, where you might have lights, sensors, and actuators all communicating with each other through a mesh network. The design emphasizes energy efficiency and simple, reliable control messages rather than high throughput.

High-bandwidth video streaming needs much higher data rates and robust throughput, which ZigBee cannot provide. Global networks require wide-area reach and scalable infrastructure beyond what ZigBee’s local, low-power mesh supports. Undersea communications face very different propagation challenges and typically use other technologies better suited to the underwater environment. So the scenario that fits ZigBee best is small-scale networks for home automation.