An IoT relay module is an electronic device that allows users to control electrical circuits remotely via the internet. It acts as an intermediary between low-voltage microcontroller signals and high-voltage electrical appliances. The module essentially enables devices like lights, fans, air conditioners, and other appliances to be turned on or off via network-based commands, such as those sent from a smartphone, computer, or even voice assistants.

    IoT relay modules typically consist of several core components, including a relay switch, a microcontroller (or microprocessor), a communication interface (such as Wi-Fi or Bluetooth), and power regulation circuitry. The microcontroller receives the command from the IoT network and activates the relay, which then completes or interrupts the electrical circuit to control the connected device.