Quarks are fundamental particles that combine to form protons, neutrons, and other hadrons. There are six types, or flavors, of quarks, but protons and neutrons are composed of up and down quarks. Discuss the concept of quarks and their role in the composition of protons and neutrons. How did the development of the quark model advance our understanding of particle physics, and what experimental evidence supports the existence of quarks? What are the implications of quark interactions for the strong nuclear force and the stability of matter?