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UV radiation is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays. UV radiation is present in sunlight, and contributes to the formation of vitamin D in the body. It also has other biological effects, such as sunburn.
Exposure to UV radiation can cause damage to the skin, eyes, and immune system. The amount of damage depends on the intensity of the UV radiation, as well as the length of time of exposure. Sunlight is the main source of UV radiation, but artificial sources such as tanning beds and lamps also emit UV rays.
The best way to protect yourself from UV radiation is to avoid exposure by staying out of direct sunlight, wearing protective clothing, and using sunscreen.