"This preface introduces the third edition of a colloid science textbook, updated after 25 years to reflect the field's expanded applications in technology, medicine, and life sciences. While maintaining its focus on fundamental aspects, the revision emphasizes clarifying the link between basic phenomena and their complex manifestations in colloidal systems. Approximately 50% of the previous edition remains, with 25% extensively reworked and 25% new material covering recent developments. Key updates include an enlarged discussion on osmotic pressure (Chapter 1), new sections on surface study methods and evaporation (Chapter 2), generalized scattering discussions (Chapter 4), and a more systematic view of surface forces (Chapter 5). Additionally, new content addresses vesicle fusion/fission (Chapter 6), coacervation (Chapter 7), colloid stability in concentrated systems (Chapter 8), particle synthesis (Chapter 9), liquid-liquid phase separation (Chapter 10), and expanded discussions on emulsions and foam stability (Chapter 11). The author acknowledges significant contributions from colleagues and dedicates the revision to their grandchildren"-- Provided by publisher.