Photon

A photon is the carrier of the electromagnetic force. It is the fundamental building block of light.

  • In the field of optics, light is explained in terms of electromagnetic waves with the properties of wavelength, frequency and energy.
  • Light sometimes exhibits wave-like behaviour, at others, it behaves like both waves and particles, and at others just as particles.
  • In physics, light is explained in terms of electromagnetic fields that propagate through space configured as bundles of photons.
  • Photons are the force carriers of radiant energy (electromagnetic radiation).
  • A photon is an elementary particle, a quantum of light (eg. visible light), so a photon is the smallest quantity (quantum, plural quanta) into which light can be divided.

https://en.wikipedia.org/wiki/Photon