UVA and UVB are two types of ultraviolet (UV) radiation that reach the Earth's surface. They differ in their wavelength, the depth to which they penetrate the skin, and the type of damage they cause. UVA radiation has a longer wavelength than UVB and can penetrate deeper into the skin. UVA rays are responsible for skin aging and can contribute to the development of skin cancer. UVA rays are present during all daylight hours, and they can penetrate through clouds and glass, making it impo...
