A bay window is a type of window that protrudes from the main walls of a building, creating a small alcove inside. It typically consists of three or more panels, with the center panel being larger and often fixed, while the side panels can be operable. This design allows for more natural light and provides a wider view of the outside landscape. Bay windows are commonly found in residential homes and can enhance the architectural appeal of a structure. They can also serve as a cozy nook for seating or plants, making them a popular choice for living rooms and dining areas.