Immunofluorescence is a laboratory technique used to visualize the presence and location of specific proteins or antigens in cells or tissue sections. This method involves using antibodies that are tagged with fluorescent dyes. When these antibodies bind to their target antigens, they emit light when exposed to specific wavelengths, allowing researchers to see the distribution of the proteins under a fluorescence microscope. This technique is widely used in biomedical research and clinical diagnostics to study diseases, including cancer and autoimmune disorders. By providing detailed images of cellular components, immunofluorescence helps scientists understand cellular functions and disease mechanisms.