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Sunscreen
Sunscreen (also known as sunblock or suntan lotion) is a lotion, spray, gel or other topical product that absorbs or reflects the sun's ultraviolet (UV) radiation and protects the skin. Sunscreens contain one or more UV filters. The SPF of a sunscreen is a laboratory measure of the effectiveness of sunscreen - the higher the SPF, the more protection a sunscreen offers against UV-B (the ultraviolet radiation that causes sunburn). The SPF indicates the time a person with sunscreen applied can be exposed to sunlight before getting sunburn relative to the time a person without sunscreen can be exposed. For example, someone who would burn after 12 minutes in the sun would expect to burn after 120 minutes if protected by a sunscreen with SPF 10.