A bay window is a three-sided window structure that protrudes out from the wall of a building, creating an alcove or bay inside the room. Typically, the side windows are angled at 30, 45, or 90 degrees, and the center window can be parallel to the wall or larger than the side windows.
On the other hand, an oriel window is a projecting window structure that is supported by brackets or corbels and cantilevered out from the wall of a building. Unlike bay windows, oriel windows are typically square or polygonal in shape and have a flat roof. Oriel windows are commonly found in Gothic and Tudor architecture.
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