What is a Sensor, Engine coolant temperature sensors, water temperature sensor

 MLX90614ESF-ACF-000-TU

MLX90614 Series 5.5 V 13.5 mA Single and Dual Zone Infra Red Thermometer - TO-39

https://www.futureelectronics.com/p/semiconductors--analog--sensors--temperature/mlx90614esf-acf-000-tu-melexis-4099248