A photoelectric sensor, also known as a photoelectric switch or photoeye, is an electronic device that detects the presence or absence of an object using light. It works by emitting a beam of light, usually infrared, and then measuring the amount of light that is reflected off or transmitted through the object being detected. This type of sensor is widely used in various industries, including manufacturing, automation, and robotics. It offers high accuracy, fast response time, and reliable performance. Additionally, photoelectric sensors can be configured to detect objects of different sizes, colors, and materials, making them highly versatile for a wide range of applications.