A biplane is a type of aircraft that has two wings stacked one above the other. This design provides extra lift, making biplanes very maneuverable and stable in the air. They were popular in the early 20th century, especially during World War I, when pilots like Eddie Rickenbacker used them for dogfights. Biplanes are often used in aerobatics and crop dusting due to their agility and ability to fly at lower speeds. Famous examples include the Sopwith Camel and the Pitts Special, which showcase the unique capabilities of this classic aircraft design.