+A **photon** is the fundamental particle, a discrete packet of [light](/wiki/light) and all other electromagnetic radiation. It has no rest mass, always travels at the speed of light, and carries a specific amount of [energy](/wiki/energy).
+## See also
+- [Electromagnetic Spectrum](/wiki/electromagnetic_spectrum)
+- [Particle Physics](/wiki/particle_physics)
+- [Wave-Particle Duality](/wiki/wave-particle_duality)
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