A fluorescence microscope is a specialized optical instrument that uses fluorescence to visualize samples. It illuminates the specimen with specific wavelengths of light, causing certain molecules, known as fluorophores, to emit light at different wavelengths. This allows researchers to observe structures and processes within cells and tissues that are otherwise invisible under standard light microscopy. These microscopes are widely used in biological and medical research, enabling scientists to study cellular functions, interactions, and dynamics. They are particularly valuable in fields like cell biology, molecular biology, and pathology, where understanding the behavior of fluorescent proteins and other labeled molecules is crucial.