What means UV A and B?

UVA and UVB refer to two types of ultraviolet (UV) radiation emitted by the sun. UVA rays penetrate the skin more deeply and are primarily associated with skin aging and the formation of wrinkles, while UVB rays are responsible for causing sunburn and play a significant role in the development of skin cancer. Both types of UV radiation can harm skin cells, making sun protection essential. Sunscreens often provide broad-spectrum protection against both UVA and UVB rays.