Spectral reflectance is a measure of how much light is reflected by a surface at different wavelengths. It is usually expressed as a percentage, indicating the proportion of incident light that is reflected back. This property is important in fields like remote sensing, where it helps in identifying materials and understanding their characteristics based on how they interact with light. Different materials have unique spectral reflectance profiles, which can be visualized as graphs showing reflectance values across various wavelengths. For example, vegetation typically reflects more near-infrared light compared to visible light, while water absorbs most wavelengths, reflecting very little. Understanding these profiles aids in applications such as environmental monitoring and agriculture.