What does SPF stand for?

SPF stands for Sun Protection Factor. This term is commonly used to indicate the level of protection that a sunscreen provides against ultraviolet (UV) rays, which are known to cause sunburn and contribute to skin cancer. The SPF number represents how long it would take for a person's skin to redden with the sunscreen applied compared to how long it would take without any sunscreen. For example, if a sunscreen has an SPF of 30, it theoretically allows a person to stay in the sun 30 times longer without getting sunburned than if they were not wearing any sunscreen.

Understanding SPF is critical for making informed choices about sun safety and skin protection. While the other options present various phrases related to skin care and sun exposure, they do not accurately capture the widely recognized meaning of SPF in the context of sunscreen and sun protection.