A mizzen staysail is a type of sail used on a sailing vessel, specifically attached to the mizzen mast. It is typically a triangular sail that helps improve the boat's stability and performance, especially when sailing downwind. The mizzen staysail is set between the mizzen mast and the main mast, providing additional power and balance to the sail plan. This sail is often used in conjunction with other sails, such as the main sail and jib, to enhance the vessel's overall efficiency. By catching the wind effectively, the mizzen staysail contributes to better maneuverability and speed, making it an important component in traditional sailing rigs.