A trimaran is a type of boat or ship that has three hulls. The main hull is larger and is flanked by two smaller outrigger hulls. This design provides greater stability and speed compared to traditional monohull boats, making trimarans popular for both recreational sailing and competitive racing. Trimarans can vary in size, from small sailing dinghies to large ocean-going vessels. They are often used in events like the America's Cup and are known for their ability to sail efficiently in various wind conditions. Their unique structure allows for a spacious deck and improved performance on the water.