UVB rays are a type of light emitted from the sun. UVB rays are known to cause sunburn, skin cancer, and accelerate skin aging. UVB rays are defined based on the length of their wave. UVB light has the wavelength between 290 and 320 nanometers.
UVB waves are shorter than the UVA ones. This is why they cannot penetrate human skin as deep as the UVA light can. At the same time, UVB light has more energy in it, meaning that it can cause a more direct damage to the skin cells (and their DNA more specifically).
Some of the popular UVB filters used in sunscreen include:
In addition to the UVB filters, broad spectrum filters offer good protection from both the UVB and UVA rays. Among them: