Ultraviolet lamps are a type of lighting that use ultraviolet radiation to produce visible light. This type of light is especially useful for killing bacteria and other microorganisms, making it a popular solution for eliminating airborne germs in hospitals, schools, and other public areas. They have been used for decades as a form of sterilization and disinfection, and are now increasingly employed in water and air treatment systems to help purify the environment. In addition, ultraviolet lamps are sometimes used in printing processes to help dry ink quickly, and they can also be used to detect counterfeit currency or other documents that contain certain types of inks.