Ultraviolet (UV) radiation is a type of electromagnetic radiation that comes from the sun and artificial sources like tanning beds. It has a shorter wavelength than visible light, which means it carries more energy. UV radiation is divided into three types: UVA, UVB, and UVC, with UVC being the most harmful but mostly absorbed by the Earth's atmosphere. Exposure to UV radiation can have both positive and negative effects. On the positive side, it helps the body produce vitamin D, which is essential for bone health. However, excessive exposure can lead to skin damage, sunburn, and an increased risk of skin cancer, making protection important when spending time outdoors.