Bay windows are architectural features that extend outward from the main walls of a building, creating a small alcove inside. They typically consist of three or more panels, with the center panel being larger and often fixed, while the side panels may open. This design allows for increased natural light and provides a wider view of the outdoors. Commonly found in residential homes, bay windows can enhance the aesthetic appeal of a room and create additional seating or display space. They are often used in living rooms and dining areas, contributing to a cozy atmosphere while improving ventilation and light flow.