What is characteristic of a flying buttress?

A flying buttress is a structural feature commonly associated with Gothic architecture. Its defining characteristic is that it stands apart from the main structure, providing support through an exterior arch that transfers the weight and thrust of the roof or vault to a support pier some distance away. This ingenious design allows builders to construct taller, more intricate structures with larger windows, leading to the iconic light-filled interiors of Gothic cathedrals.

By standing away from the walls, flying buttresses also help in reducing the lateral forces that would otherwise push the walls outward, thereby preventing collapse. This innovation not only enhances structural stability but also allows for the inclusion of stained glass windows, which are a hallmark of the style.