Quantum chromodynamics (QCD) is a fundamental theory in particle physics that describes the strong force interactions between quarks and gluons. It is a non-abelian gauge theory with SU(3) symmetry, where color charge is the QCD analog of electric charge. Gluons, the force carriers of QCD, mediate the interactions between quarks, which are the building blocks of hadrons like protons and neutrons. QCD is a crucial component of the Standard Model, and its predictions have been extensively tested and confirmed through numerous experiments over the years.
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