UVA and UVB classification

UVA and UVB are types of ultraviolet (UV) radiation from the sun. UVA has a longer wavelength and penetrates deep into the skin, contributing to aging and skin damage over time. UVB has a shorter wavelength and mainly affects the outer skin layers, causing sunburn and playing a key role in skin cancer development. Sunscreens protect against both, often labeled as UVA/UVB protection. Understanding these differences helps in choosing effective sun protection strategies—broad-spectrum sunscreens guard against both UVA and UVB rays.