The type of radiation that can penetrate human skin and cause damage is typically ultraviolet (UV) radiation. UV radiation, which is emitted by the Sun, can penetrate the skin's outer layers and alter DNA in skin cells, potentially leading to skin cancer and other health issues. Notably, there are three types of UV radiation: UVA, UVB, and UVC. Among these, UVA and UVB are most concerning for human health, as they can cause both immediate and long-term skin damage.