A photoconductor is a type of material that changes its electrical conductivity when exposed to light. When light photons hit the surface of a photoconductor, they can excite electrons, allowing them to move more freely and conduct electricity. This property makes photoconductors useful in various applications, such as in photodetectors and solar cells. Common materials used as photoconductors include cadmium sulfide and lead sulfide. These materials are often employed in devices that require light sensing or imaging, such as cameras and light sensors. The ability to convert light into electrical signals is crucial for many modern technologies.