A torsion spring is a type of spring that works by twisting. It stores energy when it is twisted and releases that energy when it returns to its original position. Torsion springs are commonly used in various applications, such as clothes pins, garage doors, and toys, where rotational movement is needed. These springs are designed to exert a torque or rotational force, making them different from other springs like compression springs or extension springs. Torsion springs can be made from various materials, including steel, and come in different shapes and sizes to suit specific needs.