Running rigging refers to the system of ropes, lines, and pulleys used on a sailing vessel to control the sails. It allows sailors to adjust the position and tension of the sails while the boat is in motion, optimizing performance and maneuverability. Key components include halyards, which raise and lower sails, and sheets, which control the angle of the sails relative to the wind. This system is essential for effective sailing, as it helps manage the forces acting on the sails. Properly maintained running rigging ensures that a vessel, such as a sloop or catamaran, can respond quickly to changing wind conditions.