A dew point sensor is a device that measures the temperature at which air becomes saturated with moisture, leading to the formation of dew. This measurement is crucial for understanding humidity levels in the environment, as it helps predict weather conditions and assess comfort levels in indoor spaces. These sensors work by detecting the temperature at which water vapor in the air condenses into liquid. They are commonly used in various applications, including HVAC systems, meteorology, and agriculture, to monitor and control humidity, ensuring optimal conditions for both comfort and productivity.