In architectural terminology, what does "fenestration" specifically refer to?

Fenestration specifically refers to the arrangement, design, and overall structure of windows and doors in a building. This term encompasses various factors, such as the size, shape, proportion, and placement of these openings, which can significantly influence both the aesthetics and functionality of a structure. Proper fenestration is crucial in architecture as it affects natural light, ventilation, and the visual appeal of a facade, contributing to the overall design intent and performance of the building. Understanding fenestration aids architects in ensuring that a design not only meets aesthetic goals but also performs well in terms of energy efficiency and occupant comfort.