This work is both an introduction to colloids and a bridge to the more specialist works available, and includes recent ideas that have been developed on the interactions between particles and the concentrated state. Chapters cover the nature of colloids, macromolecules and surfactants, interactions between colloidal particles, forces of repulsion, the stability of dispersions, the wetting of surfaces by liquids, emulsions and microemulsions, characterization of colloidal particles, and concentrated dispersions. The book can be used in undergraduate courses in chemistry, chemical engineering, physics, materials science, and pharmaceutics. Goodwin previously taught in the Department of Physical Chemistry at the University of Bristol, UK.