SSoft matter is a kind of material characterized by weak interactions, which is comparable to thermal energy. These materials are widely found in daily life and biological systems such as colloids, polymers, cell membrane, DNA and proteins. The knowledge of soft matter is essential to understand functions of biomolecules in biophysics and is also important for developing new bio-sensing techniques or new functional soft materials. This class starts from the basic physical point of view in several important aspects of soft matter and then real examples in material science or in biology will be discussed.