Mass
In atomic nuclei,i.e in :en:Protons and :en:Neutrons,the residual mass comes from the binding kinetic and potential energy of the quarks and gluon field. An analogy to go along with is to think of the 3 :en:quarks as balls with the gluons as a spring connecting the quarks. This mass accounts for ~99% of the mass of these :en:baryons with the remaining ~1% coming from the individual quarks which comes from quantum interactions with the Higgs field.