Quantum Chromodynamics (QCD) is the quantum field theory that describes the strong nuclear force, one of the four fundamental interactions in nature. It explains how quarks and gluons interact to form protons, neutrons, and other hadrons. QCD is based on the principle of color charge and the non-Abelian gauge symmetry of the strong interaction. One of its key features is confinement, which prevents quarks from existing in isolation. Another important property is asymptotic freedom, where quarks interact weakly at very high energies. QCD plays a central role in particle physics and nuclear physics, helping to explain the structure of matter at subatomic scales. Experimental validation of QCD comes from high-energy particle accelerators. Despite its complexity, QCD is a cornerstone of the Standard Model of particle physics.
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