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As we’ve tried to understand the fundamental forces of nature in the quantum domain, we’ve learnt that each force, in a sense, is communicated by a tiny bundle of that force, a tiny particle that’s the messenger of that force, so for instant, the electromagnetic force, light. When you turn on a light bulb, you are affected by the light because little tiny photons travel from the bulb, enter into your eyes, and in that way communicate with the electromagnetic force. The strong nuclear force also has a tiny bundle, a tiny particle that communicates that force and the bundle, the particle for this strong nuclear force is called the gluon, so the way that electromagnetic force is transmitted by the photon, the strong nuclear force is transmitted by the gluon.
