There are four fundamental forces in nature:
Strong force
Weak force
Electromagnetism (EM) Light is an electromagnetic wave
Gravity
All of the fundamental forces are considered Exchange Forces. In other words the force involves an exchange of one or more particles.
The exchange particles are as follows:
Strong – The pion (and others)
Electromagnetic (EM) – The photon
Weak – The W and Z
Gravity – Believed to be the graviton
An addition by Physicist:
Note: The pion does mediate the inter-nucleon force. That force isn't fundamental, however. The fundamental force is the inter-quark force that binds the quarks into hadrons (such as protons, neutrons and pions), and that is what we usually mean by the strong force, nowadays. The force between hadrons is a residual color dipole interaction that is analogous to the Van der Waals force in electromagnetism.
Glad you cleared that up.
Cha, cha, cha... You know,
epicycles can explain
retrograde motion.
If you're willing to
pile complexity onto
complexity, you
need never give up
on Ptolemy's paradigm.
Sorry. Just rambling...
"So Ptolemy adopted an instrumentalist view --- this strange model is only an accurate calculator to predict the planet motions but the reality is Aristotle's model. This apparent contradiction between reality and a calculation device was perfectly fine in his time. Our modern belief that models must characterize the way the universe actually is [!] is a tribute to the even longer-lasting influence of Aristotle's realism."