Which force dominates inside a proton?

A proton is not an indivisible object; it is made of quarks held together by the strong interaction. Gluons, the carriers of the strong force, constantly exchange color charge between quarks. This force is so strong that it not only binds quarks but also contributes most of the proton’s mass through energy. The strong interaction is described by quantum chromodynamics, which became established in the 1970s. Inside the proton, the strong force is vastly more important than gravity or electromagnetism.