Mizzen sails are a type of sail found on a sailing vessel, typically located behind the main sail. They are part of a rigging system known as a cutter or ketch, which allows for better balance and maneuverability. The mizzen sail helps to stabilize the boat and can be used to control its direction and speed. These sails are usually smaller than the main sail and are set on a mast called the mizzen mast. By adjusting the mizzen sail, sailors can optimize their vessel's performance in various wind conditions, making it an essential component of traditional sailing techniques.