The Passive Infrared (PIR) sensor module is designed for motion detection and is also known as a "Pyroelectric," "Passive Infrared," or "IR Motion" sensor. It features a built-in pyroelectric sensor, signal conditioning circuitry, and a dome-shaped Fresnel lens. The module detects movement from people, animals, or objects by sensing changes in infrared radiation. PIR sensors are widely used in security systems like burglar alarms and in automation systems such as motion-activated lighting. Their reliability, low power consumption, and ease of use make them a popular choice for a variety of motion-sensing applications.