Electromagnetic energy is a form of energy that can be reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space.
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A photon is a particle representing a quantum of light or other electromagnetic radiation. It carries energy proportional to the radiation frequency but has zero rest mass.
Frequency is the number of complete wave cycles per second, measured in hertz (Hz). In terms of electromagnetic energy, it determines color for visible light and energy level for photons.