Soft matter represents a collection of materials such as polymer, colloids, surfactants, and liquid crystals and their composites. These materials do not belong to conventional classes of materials (simple fluids or solids), but they are used extensively in our everyday life and in modern technology (in displays, device manufacturing, energy-saving technology, bio-medical applications, etc.). Soft matter consists of units much larger than atoms; their typical length is 0.01 μm-100 μm. This gives two characteristics to soft matter: large non-linear response to external forces; and long relaxation time and slow dynamics. The aim of this book is to discuss the materials of such characteristics for undergraduate and graduate course students explaining basic physical concepts such as phase transition and Brownian motion. Attempts have been made to connect such physics to our experience in everyday life.