This book presents an overview on the various aspects of fundamentals and applications of microemulsions. The increasing utility of microemulsions across various spheres has kept research work in this relatively older field of study to continue at a steady pace. Scientists across various domains are still extremely keen on research in this field. This book brings forth an evaluation of key factors that affect various traits and performance of the microemulsions, including their primary kinds of uses. Various facets and functions of microemulsions and modeling investigations on microstructure and phase behavior of these systems have been discussed. Discussions on uses of diverse kinds of microemulsions, namely, use in drug delivery, vaccines, oil industry, preparation of nanostructured polymeric, metallic and metal oxides materials for different applications have also been provided in this book.