A pendulum is a simple device that swings back and forth around a fixed point. It typically consists of a weight, called a bob, attached to a string or rod. When the bob is pulled to one side and released, it moves in a regular, repeating motion due to the force of gravity. This motion can be observed in many places, such as in clocks, where a pendulum helps keep time accurately. Pendulums are not just for clocks; they also have applications in science and art. For example, the famous Foucault pendulum demonstrates the rotation of the Earth. Additionally, pendulum waves create mesmerizing visual patterns, showcasing the principles of physics in an engaging way.