Quantum hadrodynamics (QHD)[1] is an effective field theory pertaining to interactions between hadrons, that is, hadron-hadron interactions or the inter-hadron force.
It is "a framework for describing the nuclear many-body problem as a relativistic system of baryons and mesons".
[1] Quantum hadrodynamics is closely related and partly derived from quantum chromodynamics, which is the theory of interactions between quarks and gluons that bind them together to form hadrons, via the strong force.
It is the force operating between those hadrons which are nucleons – protons and neutrons – as it binds them together to form the atomic nucleus.
Since mesons are themselves hadrons, quantum hadrodynamics also deals with the interaction between the carriers of the nuclear force itself, alongside the nucleons bound by it.