All light is made of photons that are so small that they cannot be seen individually. They behave in some ways like particles, and in other ways like waves. it is not just sunlight and visible light that is made up of photons; radio waves, television broadcasts, X-rays, and the ultraviolet rays are all made up of photons.
The original concept of the photon was devoloped by Albert Einstein, but it was scientist Gilbert N. Lewis who first used the word 'Photon' to describe this bundle of electromagnetic energy.
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