What does SPF stand for?

SPF stands for Sun Protection Factor. This term is critical when discussing sunscreen and other sun protection products. It indicates the level of protection the product provides against the sun's ultraviolet B (UVB) rays, which are the primary cause of sunburn and can contribute to skin cancer. The SPF number helps consumers understand how long they can stay in the sun without burning compared to using no protection at all. For example, if a person usually burns after 10 minutes in the sun without protection, using a sunscreen with SPF 30 theoretically allows them to stay in the sun 30 times longer—about 300 minutes—before burning. Understanding SPF is essential for making informed choices about sun safety and skin care.