Sunscreen (also known as sunblock)'s a lotion, spray, gel or other topical product that absorbs or reflects some of the sun's ultraviolet (UV) radiation on the skin exposed to sunlight and thus helps protect against sunburn. Sunscreens contain one or more UV filters of which there're three main types : Organic chemical compounds that absorb ultraviolet light (such as oxybenzone, a suspected photocarcinogen) Inorganic particulates that reflect, scatter, and absorb UV light (such as titanium di… (More on Sunscreen)