Humans are only able to see a small portion of this radiation called, appropriately, visible light. The vast majority is beyond human perception. Almost all of the sun's energy beams on the earth at levels that are harmless to humans. UV radiation is the exception. It's the part of the electromagnetic spectrum that can reach a high enough level on earth to damage plants and animals.
Ultraviolet radiation falls under three categories separated by wavelength.
In general, the shorter the wavelength the more energetic the radiation making it damaging to plants and animals. UV-C can do great damage but fortunately poses no risk to life on earth. It is completely filtered out by oxygen and ozone in the stratosphere. Ozone also plays a vital role in filtering UV-B, the ultraviolet radiation that is the greatest threat to life on earth. But even a fully functioning ozone layer does not absorb all the UV-B rays.