A groin vault is an architectural feature formed by the intersection of two barrel vaults at right angles. This design creates a more complex ceiling structure that allows for greater height and space in a room. The groin vault is often used in large buildings, such as churches and cathedrals, to support the weight of the roof while providing an aesthetically pleasing appearance. The use of groin vaults dates back to ancient times, with notable examples found in Roman architecture. They were later popularized during the Gothic period, where they contributed to the grandeur of structures like Notre-Dame Cathedral. This technique not only enhances structural integrity but also allows for the inclusion of large windows, filling the space with light.