"Electro-magnetism, which underlies all chemistry; its quantum is the Photon. The Strong Force binds atoms together; its quantum is the Gluon. The Weak Force causes radioactive decay; its quantum is the Boson. The weakest of all Gravity has weightless Graviton."
A summary of what quanta (packets of energy) are tossed back and forth between matter so they can interact and forces transmitted.
From the book google: [Introducing Newton and Classical Physics]