Radiation

Radiation is a form of energy. There are two basic types of radiation: ionizing and non-ionizing radiation. The difference between these two types is the amount of energy they have. Ionizing radiation (energy more than 5 eV) has the ability to ionize atoms, which means that electrons could be removed from the atoms. Non-ionizing radiation (energy less than 3 eV), like i.e. UV-light and visible light could not ionize atoms.