The document discusses the nature of photons and electromagnetic waves. It describes a photon as a self-sustaining, traveling electromagnetic wavepacket that propagates at the speed of light. A photon is also characterized as a spin wave with quantized spin angular momentum. Photons are interpreted as disturbances in a quantum vacuum composed of Planck mass dipoles, with the electric field representing an alignment of these dipoles and the magnetic field representing their vortical motion. Electromagnetic wave propagation, reflection, refraction, and diffraction are also examined in the context of the quantum vacuum.