This document provides an overview of Quantum Chromodynamics (QCD), the theory of strong interactions. It discusses key aspects of QCD including:

- Evidence for the existence of quarks and the color quantum number, including experimental tests showing that quarks have three possible color states. 

- Asymptotic freedom, the phenomenon where the strong force becomes weaker at short distances, which allows the application of perturbation theory to study high energy strong interactions.

- Symmetries of QCD such as chiral symmetry and its dynamical breaking at low energies, which helps explain the masses of hadrons.

The document provides context and background for understanding fundamental properties of QCD and the strong nuclear force.

Departament de F Isica Te' Orica, IFIC, Universitat de Val' Encia - CSIC Apt. Correus 2085, E-46071 Val' Encia, Spain E-Mail: Antonio - Pich@uv - Es PDF

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