Periodic phenomena are events or processes that occur at regular intervals. Examples include the changing of the seasons, the phases of the moon, and the oscillation of a pendulum. These phenomena can often be predicted based on established patterns, making them essential for various scientific studies and applications. In nature, periodic phenomena can be observed in many forms, such as the tides caused by the gravitational pull of the Moon and Sun. In physics, concepts like harmonic motion describe systems that repeat their motion over time, such as a swinging pendulum or a vibrating string. Understanding these patterns helps scientists and researchers in fields ranging from astronomy to engineering.