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A photo diode is a semiconductor device that converts light into electrical current. It is used in light sensing applications such as optical communication, automation, and security systems. The diode operates in photoconductive mode, where the generated current is proportional to the intensity of incident light. It has a fast response time and high sensitivity, making it ideal for light detection in scientific and industrial applications. The photodiode can be used in proximity sensors, barcode scanners, and medical instruments. It works effectively with both visible and infrared light sources.