Quantum Chromodynamics (QCD) is the theory in particle physics that describes the strong interaction, one of the four fundamental forces in nature. The strong interaction is responsible for binding quarks together to form protons, neutrons, and other hadrons, as well as holding protons and neutrons together in atomic nuclei.
Key concepts of QCD include:
1. **Quarks and Gluons**: Quarks are elementary particles and fundamental constituents of


