Magneto-optical materials are substances that exhibit a change in their optical properties when subjected to a magnetic field. This phenomenon is known as the Faraday effect, where the polarization of light is rotated as it passes through the material. These materials are commonly used in applications like data storage and optical devices. These materials can be found in various forms, including thin films and bulk solids, and are often made from compounds like garnets or transition metal oxides. Their unique properties make them valuable in technologies such as magneto-optical recording and optical isolators, enhancing performance in telecommunications and information processing.