Ultraviolet (UV) radiation is a type of electromagnetic radiation that comes from the sun and can also be produced by artificial sources like tanning beds. UV radiation is invisible to the human eye but can have harmful effects on the skin and eyes. There are three types of UV radiation: UVA, UVB, and UVC. UVA rays can cause premature aging and skin damage, while UVB rays are responsible for sunburns and skin cancer. UVC rays are the most dangerous but are mostly absorbed by the Earth's atmosphere. It is important to protect yourself from UV radiation by wearing sunscreen, sunglasses, and protective clothing when spending time outdoors.