Sunscreen is a lotion or cream that helps protect your skin from the harmful effects of the sun's rays. It contains special ingredients that absorb or reflect ultraviolet (UV) light, which can cause sunburn and increase the risk of skin cancer. Applying sunscreen before going outside is important, especially on sunny days or when spending time at the beach. To get the best protection, it's essential to choose a sunscreen with a high SPF (Sun Protection Factor) rating and to reapply it every two hours. Remember to cover all exposed skin, including areas like your face, ears, and neck, to keep your skin safe and healthy.