Photoelectric sensors are advanced devices used to detect objects, changes in surface conditions, and other variables through light. They are widely utilized in automation, manufacturing, and process control due to their high precision, reliability, and fast response times. Key types include through-beam, retro-reflective, and diffuse reflective sensors, each suited for different detection ranges and environmental conditions. Common applications include object counting, position sensing, and quality inspection. These sensors often feature adjustable sensitivity, rugged housing for industrial use, and compatibility with various control systems.