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, which helps the clock keep accurate time. This design was first perfected by Christiaan Huygens in the 17th century, making it one of the most reliable timepieces of its era. The basic components of a pendulum clock include the pendulum, a gear train, and a clock face. The pendulum's length determines the frequency of its swings, allowing for precise time measurement. These clocks are often found in homes and museums, showcasing both their functionality and craftsmanship.