Ultraviolet (UV) is a type of electromagnetic radiation that is invisible to the human eye. It has a shorter wavelength and higher energy than visible light, and is found in the region of the electromagnetic spectrum between X-rays and visible light. UV radiation is produced naturally by the sun and is also used in a variety of artificial sources, including black lights, germicidal lamps, and UV lasers. It is divided into three categories based on its wavelength: UVA, UVB, and UVC. UVA radiat...