The electromagnetic spectrum includes ultraviolet (UV) radiation, which can start photochemical reactions due to its high energy and position between visible light and X-rays. The germicidal characteristics of UV-C light, which falls within the UV LED 255-260nm (UVC) wavelength range, make it stand out among the other forms of ultraviolet light. This section explores the basics of ultraviolet-C light-emitting diode technology, including its unique characteristics and the scientific concepts that make it effective against germs.