What is the purpose of a flying buttress in architecture?

The purpose of a flying buttress in architecture is primarily to provide support outside the structure. This design feature is essential in Gothic architecture, where it allows for taller walls and larger windows. By transferring the weight of the roof and upper walls to a support that is set apart from the main structure, flying buttresses help maintain the stability of the building while also enabling the inclusion of expansive stained glass windows. The structural innovation of flying buttresses allowed architects to develop the awe-inspiring verticality and light-filled interiors characteristic of Gothic cathedrals, making it a crucial element in advancing both function and aesthetics in architectural design.