As the first treatment of this subject to surface in more than 15 years, this multidisciplinary, yet integrated work offers a definitive, up-to-date portrait of modern colloidal electro-optic science and applications. The text illustrates the unique advantage of using electro-optics as an alternative to conventional characterization and analysis of macromolecular, small-particle, and nanomolecular colloidal systems. It explains the fundamental principles, strategies, and applications of electro-optic techniques such as electric birefringence, electric dichroism, and electric light scattering. It also highlights the latest achievements in electro-optic theory, particularly low-frequency relaxation.