Stellar oscillations refer to the rhythmic pulsations or vibrations that occur in stars, including our Sun. These oscillations can be caused by various factors, such as changes in temperature and pressure within the star's interior. By studying these oscillations, scientists can gain insights into the star's internal structure and dynamics. These oscillations are often detected through a technique called asteroseismology, which analyzes the frequencies of the waves produced by the pulsations. This method allows astronomers to learn more about a star's age, composition, and evolutionary stage, enhancing our understanding of stellar life cycles and the universe.