Answer :
The architectural achievement that, in part, makes Gothic buildings so tall and yet so stable is the use of rib vaults.
A rib vault, also known as a ribbed vault, is an architectural element used to cover a large area, such as the nave of a church. It is made of a framework of crossed or diagonally arranged arching ribs.
Roman architecture, Byzantine architecture, Islamic architecture, Romanesque architecture, and particularly Gothic architecture all utilized variations. The ribs are separated by thin stone panels. As a result, the weight and the vault's outward force were significantly reduced. The ribs direct the load downward and outward to particular locations, typically piers or rows of columns.
Gothic cathedral architects were able to create higher, thinner walls and significantly larger windows thanks to this feature.
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