A bay window is a type of window that protrudes from the external wall of a building, creating a bay or alcove inside the room. It typically consists of a central windowpane, called a fixed sash, flanked by two or more smaller windows, known as casement or double-hung windows. The arrangement creates a panoramic view of the outside, allows more natural light to enter the room, and provides additional space within the room. Bay windows are often designed to extend beyond the exterior wall, forming a small nook or seating area inside, which can be used for various purposes such as reading, display, or simply enjoying the view. They are commonly found in residential buildings, particularly in living rooms, dining areas, or bedrooms, but can also be seen in commercial or public structures.