A dew point sensor is a device that measures the temperature at which air becomes saturated with moisture, leading to condensation. This measurement is crucial in various applications, including HVAC systems, weather forecasting, and industrial processes, as it helps monitor humidity levels and prevent issues like mold growth or equipment corrosion. These sensors typically use either capacitive or resistive technology to detect changes in humidity. By providing accurate dew point readings, they enable better control of environmental conditions, ensuring comfort and safety in both residential and commercial settings.