A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings.
Low wing on a Supermarine Spitfire
Mid wing on a de Havilland Vampire T11
High wing on a de Havilland Canada Dash 8
Parasol wing on a Consolidated PBY Catalina
A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircr
Monoplane
…A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings. A monoplane has inherently the highest efficiency and lowest drag of any wing configuration…
First World War Sopwith Camel biplane
1920s biplane hang glider
The Gloster Gladiator, a biplane World War II fighter
Soviet Antonov An-2 biplane from the 1940s