A phenomenon in which a substance absorbs light at a specific wavelength and subsequently emits light at a longer wavelength. This emission of light is usually of a different color than the absorbed light. Fluorescence is commonly observed in certain materials, such as fluorescent dyes and compounds, quantum dots, and some minerals. It is widely used in various applications, including microscopy, medical imaging, forensics, and environmental monitoring. The emitted light provides valuable information about the properties and composition of the substance under examination. Fluorescence is utilized in diverse scientific fields, allowing for sensitive detection and analysis, as well as creating visually striking effects in artistic and entertainment contexts.