Stellar oscillations refer to the rhythmic pulsations that occur in stars, caused by various physical processes within them. These oscillations can be detected as variations in brightness and temperature, providing valuable information about a star's internal structure and dynamics. These pulsations are often studied in the field of asteroseismology, which analyzes the waves traveling through a star. By observing these oscillations, scientists can infer details about a star's age, composition, and evolutionary stage, enhancing our understanding of stellar life cycles and the universe.