Full Idea
The exchange of photons drives the electro-magnetic force.
Gist of Idea
Photon exchange drives the electro-magnetic force
Source
Frank Close (Theories of Everything [2017], 6 'Superstrings')
Book Reference
Close,Frank: 'Theories of Everything' [Profile Books 2017], p.118
A Reaction
So light, which we just think of as what is visible, is a mere side-effect of the engine room of nature - the core mechanism of the whole electro-magnetic field.