This book reviews the physical-chemical properties of individual and mixed surfactant systems and its application in various industry sectors to produce household and personal care products. The book starts off with experimental along with theoretical approaches to study the microscopic behavior of surfactants. In particular, it looks into a characteristic of surfactant molecules ability to associate into micelles in solutions and the formation of mixed micelles when they are formed from more than one species of surfactant of different nature. Mixed micelles are very useful in biotechnology, pharmaceuticals, and medicine formulation, enhanced oil recovery, micellar solubilization, dispersion, suspension, anti-corrosion agent as described by the various chapters in this book. This book caters to students and researchers, whose area of interest are surfactant systems and their role in different area of science.