The main purpose of wearing sunscreen is to protect the skin from the harmful effects of ultraviolet (UV) radiation emitted by the sun. Sunscreen works by absorbing, reflecting, or scattering UV rays, which can lead to skin damage, sunburn, and an increased risk of skin cancer. By applying sunscreen with an appropriate SPF (Sun Protection Factor), individuals can reduce their exposure to both UVA and UVB rays. Regular use of sunscreen is essential for long-term skin health, especially during outdoor activities or prolonged sun exposure.