IT has a corposular-wave duality. It has the properties of interference, diffraction as a wave and mass, as a particle. A photon does not have a rest mass. Low-frequency photons are described by the laws of classical electrodynamics, as having vector characteristics-polarization, tension and scalar-energy, which is proportional to the second degree of tension. More often they say - the electromagnetic field. This field is generated by moving charged particles. High-frequency photons are often called quanta, they are described by the laws of quantum physics, as a separate particle, having a mass and energy proportional to the frequency. They are generated as a result of the transition of an electron in an ethomium to a low energy level.