Fluoresce is a phenomenon in which a substance emits light when exposed to certain types of radiation. It is a type of photoluminescence, which is the emission of light from a material that has absorbed energy from other sources. Fluorescence is different from phosphorescence, which is the emission of light after the source of energy has been removed. Fluorescence is commonly seen in minerals, organic compounds, and some living organisms. The term 'fluoresce' comes from the Latin word 'fluor, ' meaning 'to flow.'