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A Photon is a mass less piece of energy
Photons should not be called `energy’, or `pure energy’, or anything similar. All particles are ripples in fields and have energy; photons are not special in this regard. Photons are stuff; energy is not.-------The term “pure energy” is a mix of poetry, shorthand and garbage. Since photons have no mass, they have no mass-energy, and that means their energy is “purely motion-energy”. But that does not mean the same thing, either in physics or intuitively to the non-expert, as saying photons are “pure energy”.