Ultraviolet (UV) light is a type of electromagnetic radiation that comes from the sun and artificial sources like tanning beds and black lights. It has a shorter wavelength than visible light, which means it is not visible to the human eye. UV light is divided into three categories: UVA, UVB, and UVC, each with different effects on living organisms. UV light plays a significant role in various processes, such as the production of vitamin D in the skin, which is essential for bone health. However, excessive exposure to UV light can lead to harmful effects, including sunburn, skin aging, and an increased risk of skin cancer.