Copper vs Fiberoptics

Hello, My understanding of the difference between the two is that copper uses the movement of electrons whereas fiber optics uses light signaling.

Now I have read that both copper and fiber uses EM signals. But this can't be true. Copper depends on the movement of electrons, which is near speed of light, yes. But it is not the equivalent of an EM wave. Electromagnetic waves are not the movement of electrons, but a wave in the electromagnetic field, or photos.....which is distinctly different from electron movement.

Or am I wrong?