Pierre-Henri Puech, together with Françoise Brochard-Wyart (UPMC) and Pierre Nassoy (CNRS) co-authored a book proposing an educational synthesis of the physico-chemistry of soft matter. This domain, at the interface between physics and chemistry, also called complex fluids or self-organized systems, concerns materials based on liquid crystals, polymers or surfactants that are organized via weak interactions. The founding principles of this discipline are summarized, based on simple arguments inspired by the teaching method of Pierre-Gilles de Gennes, Nobel Prize in Physics in 1991. The extension of these concepts to biological systems also serves as an introduction to modern biophysics. Each concept is illustrated with an example from experiments or industrial applications, as well as the study of biological processes. The book will be available in bookstores and on dunod website from February 28th 2018.