The strong force binds quarks in protons from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
The strong force is the glue that holds the fundamental building blocks of matter, called quarks, together inside protons. Without this force, the quarks would fly apart due to their mutual repulsion. The strong force is one of the four fundamental forces in nature, along with gravity, electromagnetism, and the weak force. It is the strongest of these forces but also has the shortest range, acting only over distances comparable to the size of an atomic nucleus. Quarks are never found in isolation but are always bound together in groups of two or three by the strong force. These groups of quarks form particles known as hadrons, which include protons and neutrons. Inside a proton, for example, there are three quarks bound together by the strong force. The strong force is mediated by particles called gluons, which carry the force between quarks. Gluons are unique in that they themselves carry the strong force, unlike photons that mediate the electromagnetic force. This self-interaction of gluons leads to a phenomenon known as confin...
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