Crystal lattice dynamics refers to the study of the vibrations and movements of atoms within a crystal structure. In a crystal, atoms are arranged in a repeating pattern, and their interactions can lead to various vibrational modes. These vibrations can affect the material's properties, such as thermal conductivity and electrical behavior. Understanding crystal lattice dynamics is essential in fields like solid-state physics and materials science. It helps researchers predict how materials will respond to changes in temperature or pressure, which is crucial for developing new materials and technologies, including semiconductors and superconductors.