Electromagnetic radiation is just light, and anything shorter wavelength than visible light can be harmful. Radio waves(like wifi) and infrared are longer wavelength than visible light. If you’re exposed to EXTREMELY high levels of light at these wavelengths, you get burned just because of the heat transferred.
Ionizing radiation is the kind that gives you radiation poisoning and cancer, it has enough energy to rip electrons off of atoms, and can cause chemical reactions that don’t normally happen.
Neutron radiation is the kind that can make things radioactive.
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