The Physics of Materials is an important fundamental course and is required for all the students with major in Materials Science and Engineering. This course covers the basic theory for understanding the properties of materials, including electron theory and band theory in solids. It also introduces the electrical, magnetic, optical, and thermal properties of materials, the characterization of these properties, and their relationship with the structures of materials. The state-of-art devices, applications, and future based on materials properties will also be introduced.