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Sunscreen is a topical cosmetic product applied to prevent the harmful effects of ultraviolet (UV) radiation on the skin. UV radiation is divided into three main categories based on wavelength: UVC (100–280 nm), UVB (280–315 nm), and UVA (315–400 nm). While UVC is filtered by the atmosphere and does not reach the Earth’s surface, UVB and UVA rays can reach the ground and cause skin damage. UVB is responsible for triggering melanogenesis—the process of melanin production—and for most sunburns, wh

Sunlight is the natural light emitted by the Sun and reaching the Earth's surface. Due to refraction, reflection, and scattering phenomena in the atmosphere, it is perceived in different colors and intensities. Sunlight lies within the visible light region of the electromagnetic spectrum and serves as the primary light source detectable by the human eye.Physical PropertiesSunlight encompasses the range of light with wavelengths approximately between 400 and 700 nanometers. Although perceived as