Reflectivity is the ability of a surface to reflect light or other forms of electromagnetic radiation. It is often expressed as a percentage, indicating how much light is reflected compared to how much hits the surface. Different materials have varying levels of reflectivity; for example, a mirror has high reflectivity, while a black surface absorbs most light and has low reflectivity. In scientific terms, reflectivity can be influenced by factors such as the angle of incidence, the wavelength of the light, and the texture of the surface. This property is important in various fields, including optics, photography, and solar energy, where materials are chosen based on their reflective characteristics to optimize performance.