Fluorescent dyes are special types of colored substances that can absorb light and then re-emit it at a different wavelength, usually producing a bright glow. These dyes are commonly used in various fields, including biology and chemistry, to help visualize structures and processes. For example, in microscopy, fluorescent dyes can tag specific cells or proteins, making them easier to see under a microscope. These dyes are often used in medical diagnostics and biotechnology to track biological molecules or cells. When exposed to certain types of light, they emit vibrant colors, allowing scientists to study complex interactions in living organisms. Their ability to provide clear, vivid images makes them invaluable tools in research and clinical settings.