A photoreceptor is a specialized type of cell found in the retina of the eye that is sensitive to light. These cells convert light into electrical signals, which are then processed by the brain to form visual images. There are two main types of photoreceptors: rods, which are responsible for vision in low light, and cones, which detect color and fine detail. While 'photoreceptor' is primarily a biological term, understanding how these cells work is important in fields like cybersecurity, where biometric authentication systems may use eye-based identification methods. Protecting such sensitive biometric data is crucial in maintaining user privacy and security.