Magneto-optics is the study of how magnetic fields affect the behavior of light in materials. This phenomenon occurs when the properties of a material change in the presence of a magnetic field, leading to effects such as changes in light polarization or reflection. One common application of magneto-optics is in optical devices like isolators and polarizers, which are used to control light in telecommunications and laser systems. By manipulating light with magnetic fields, these devices enhance performance and protect sensitive components from unwanted reflections.