The field of colloid and interface chemistry and physics is exceptionally complex and of immense and steadily increasing importance for nearly all areas of natural and life sciences as well as engineering. This textbook is aimed at all students of chemistry and biology in master's or bachelor's degree programs. It is the first introductory textbook on this topic and summarizes the chemical, physical, and technological foundations of this current field at the level of a bachelor's specialization. It fills a gap, as until now, many students have had to painstakingly gather the foundational knowledge presented in this book from numerous very specialized textbooks on different subjects.