A pendulum clock is a timekeeping device that uses a swinging pendulum to regulate its movement. The pendulum swings back and forth at a consistent rate, allowing the clock to keep accurate time. This design was first perfected by Christiaan Huygens in the 17th century, significantly improving the accuracy of clocks. The basic components of a pendulum clock include the pendulum, a gear train, and a clock face. The pendulum's length determines the time it takes to complete one swing, which is crucial for maintaining precise time. These clocks are often found in homes and public spaces, showcasing both functionality and craftsmanship.