Periodic motion refers to the movement of an object that repeats itself at regular intervals. This type of motion can be observed in various systems, such as a swinging pendulum or a vibrating guitar string. The time taken for one complete cycle of motion is known as the period, and it remains constant for ideal systems. Examples of periodic motion are abundant in nature and technology. The rotation of the Earth around its axis and the orbit of planets around the sun are both forms of periodic motion. Understanding these motions helps in predicting behaviors in mechanical systems and natural phenomena.