What is meant by "UVA" and "UVB"? | Sally Beauty

What is meant by "UVA" and "UVB"?

The sun emits several different types of radiation in addition to the visible light that we see. Ultraviolet A (UVA) and ultraviolet B (UVB) are two important types of invisible light that are potentially dangerous to your skin and are responsible for tanning and burning. Burning rays are more typical in the UVB range, but both promote photo-damage and the potential for skin cancer.