How are SPF and suncream linked?

SPF, or Sun Protection Factor, measures the effectiveness of sunscreen in protecting the skin from UV radiation, specifically UVB rays that cause sunburn. Sunscreen, often referred to as sun cream, contains active ingredients that absorb or reflect these harmful rays, with the SPF rating indicating how long it can protect the skin compared to unprotected skin. For example, an SPF of 30 means it would take 30 times longer for the skin to burn than without protection. Therefore, SPF is a critical aspect of sun cream formulations, guiding consumers in selecting the appropriate level of protection.