Ultraviolet rays are emitted by the ☀️ and UVB are of higher energy and less penetration into the skin. They only reach our second layer of skin, that is, to the dermis, which, as I mentioned previously, are responsible for sunburn, alterations in cellular DNA and skin cancer.
UVA rays have a lower energy than UVB, but have greater penetration into the dermis, which are responsible for premature aging and are what cause spots, wrinkles, sagging, sun allergies and skin cancer.