Authors:

Light is something like raindrops each little lump of light is called a photon and if the light is all one color, all the "raindrops" are the same.

Richard P. Feynman (2014). “QED: The Strange Theory of Light and Matter”, p.14, Princeton University Press
Light is something like raindrops each little lump of light is called a photon and if the light is all one color, all the raindrops are the same.