Sections: I. Physical Optics. 1. Fresnel and Fraunhofer diffraction. 2. Fourier transform and convolutions. 3. Imaging and diffraction. II. Kinematical Diffraction. 4. Radiations and their scattering by matter. 5. Scattering from assemblies of atoms. 6. Diffraction from crystals. 7. Diffraction from imperfect crystals. III. Dynamical Scattering. 8. Diffraction by perfect crystals. 9. Dynamical diffraction effects. 10. Extension to many beams. 11. Multi-slice approaches. IV. Applications to Selected Topics. 12. Diffuse scattering and absorption effects 13. Electron microscope imaging. 14. K-line patterns and channelling. 15. Application of dynamical effects in single crystals. 16. Mosaic crystals and polycrystalline materials. 17. Ordering of atoms in crystals. 18. Extended defects. 19. Diffraction from surfaces. References. Index.