UV-A is a type of ultraviolet radiation that comes from the sun. It has a longer wavelength than UV-B and UV-C, allowing it to penetrate deeper into the skin. This type of radiation is responsible for skin aging and can contribute to the development of skin cancer over time. Unlike UV-B, which primarily affects the outer layer of the skin, UV-A can reach the deeper layers, causing damage to collagen and elastin. It is important to protect your skin from UV-A exposure by using sunscreen with broad-spectrum protection and wearing protective clothing when outdoors.