TCRT5000 Infrared Reflective Line Track Sensor Module, commonly used in robotics for line following and obstacle avoidance. It uses an infrared emitter and phototransistor detector to sense reflected infrared light, differentiating between reflective (e.g., white) and non-reflective (e.g., black) surfaces or objects. Similar to KY-033 module, just bit simpler and with different layout which makes it more practical in certain applications