Biplanes are aircraft that have two wings stacked one above the other. This design provides increased lift and stability, making them suitable for various flying activities, including aerobatics and crop dusting. Biplanes were popular in the early 20th century, especially during World War I, due to their maneuverability and ability to fly at lower speeds. The structure of a biplane typically includes a fuselage, wings, and a tail. Famous examples of biplanes include the Sopwith Camel and the Curtiss JN-4 "Jenny". While modern aircraft often use monoplanes, biplanes remain a favorite among aviation enthusiasts and are still used in airshows.