Infrared sensors are devices that detect infrared radiation, which is a type of electromagnetic radiation with wavelengths longer than visible light. These sensors can measure temperature, detect motion, or identify objects based on their heat signatures. They are commonly used in various applications, including security systems, remote controls, and thermal imaging. There are two main types of infrared sensors: active sensors, which emit their own infrared light and measure the reflection, and passive sensors, which only detect the infrared radiation emitted by objects. These sensors are widely utilized in industries such as automotive, healthcare, and environmental monitoring.