Pulsation modes refer to the different patterns of oscillation that can occur in stars, particularly in variable stars. These modes describe how a star expands and contracts over time, leading to changes in brightness. Each mode has a specific frequency and can be influenced by factors such as the star's mass and temperature. In astrophysics, pulsation modes are crucial for understanding stellar structure and evolution. By studying these modes, scientists can gain insights into a star's internal processes and age. This information helps astronomers classify stars and understand their life cycles, contributing to our broader knowledge of the universe.