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Sunscreens are the agents which are used to prevent the skin from the harmful ultraviolet radiation of sun. These agents act as a barrier for the sun rays. Sunscreen can be physical, chemical or natural sunscreen. The effectiveness of sunscreen agents can be measured in terms of Sun Protection Factor (SPF). A sunscreen having SPF value 15 have enough efficacy and products having SPF 15 are widely used. The application of sunscreens also has some harmful effects. Most important is deficiency of vitamin D in the body due to less exposure of the body to sun rays. So sunscreens should be applied in such a manner so that their harmful effects are minimized. The following discussion covers various aspects of sunscreen agents.