Condensed matter physics is a sub-discipline of physics that investigates the macroscopic physical properties of materials, focusing on how the collective behavior of constituent atoms and particles determines observable properties. It concerns itself with the study of solids, liquids, and other phases of matter, examining phenomena that arise from the periodic arrangement and interaction of particles. Key areas of study include the electronic band structure of crystalline materials, superconductivity, and exotic states of matter. The field often utilizes quantum mechanical principles to explain material characteristics such as electrical conductivity, thermal properties, and magnetic responses, providing foundational knowledge essential for advanced technologies and material science.