The book begins with a brief review of some basic principles of crystalline solid-state physics and chemistry. The topics covered in the main part of the book include: (1) disordered crystalline solids, including macroscopic defects, incommensurate phases, low dimensional systems (correlated electrons), heavily doped and compensated semiconductors, ternary semiconductors and metals, quasi-crystals, and disordered molecular crystals (inorganic and organic); (2) amorphous solids (inorganic and organic), including structure and models of structure, electronic structure, vibrational properties, optical properties, electron-phonon interactions, defects, magnetic properties, and superconductors.