1. Properties of the S-matrix; 2. Regge poles; 3. Introduction to soft hadronic processes; 4. Duality; 5. Photon-induced processes; 6. QCD: perturbative and nonperturbative; 7. Hard processes; 8. Soft diffraction and vacuum structure; 9. The dipole approach; 10. Questions for the future; Appendix A. Sommerfeld-Watson transform; Appendix B. The Group SU(3); Appendix C. Feynman rules of QCD; Appendix D. Pion-nucleon amplitudes; Appendix E. The density matrix of vector mesons.