Photon

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A photon is an elementary particle, the quantum of light and all other forms of
electromagnetic radiation, and the force carrier for the electromagnetic force,
even when static via virtual photons. The effects of this force are easily
observable at both the microscopic and macroscopic level, because the photon has
zero rest mass; this allows long distance interactions. Like all elementary
particles, photons are currently best explained by quantum mechanics and exhibit
wave–particle duality, exhibiting properties of both waves and particles. For
example, a single photon may be refracted by a lens or exhibit wave interference
with itself, but also act as a particle giving a definite result when its
position is measured.