Everyone loves summer, and there is nothing more fun than being out in the sun on a hot summer day. However, the sun can also be dangerous. Prolonged exposure to the sun is the most preventable risk factor for skin cancer. Sun exposure can also cause retina damage, cataracts, and even immune suppression. The main hazard of sunlight comes from its ultraviolet rays, specifically the UVA and UVB rays. UVA leads to aging, and UVB leads to burning.