A grandfather clock is a tall, freestanding clock that typically features a pendulum and weights. It is known for its distinctive design, often made of wood, and can be intricately carved. The clock's mechanism allows it to keep accurate time, with the pendulum swinging back and forth to regulate the movement of the clock hands. These clocks originated in the late 17th century and became popular in the 18th and 19th centuries. The name "grandfather clock" is believed to have come from a song written in the 1870s. Today, they are considered both functional timepieces and decorative antiques.