How does a humidity sensor switch work to regulate the level of moisture in the air?

A humidity sensor switch works by detecting the amount of moisture in the air and then activating or deactivating a device, such as a humidifier or dehumidifier, to regulate the level of moisture. When the sensor detects that the humidity is too high or too low, it triggers the device to turn on or off, helping to maintain the desired level of moisture in the air.