Hi, Please could someone explain the differences between the strong interaction (force that hold nucleons together) and the strong force (force that holds quarks together) in terms of the exchange particles. I have been reading several online sources and there seems to be some disagreement. They all say that the exchange particle inside a nucleon (between quarks) is a gluon. However, the exchange particle between nucleons (e.e. proton-proton or proton-neutron) some sources say is still a gluon whilst others say this is a common misconception and that the exchange particle is a virtual pion between nucleons. Please could someone confirm which is the most accepted view currently? Thanks!