A vestibule is a small entrance hall or space located at the front of a building, often serving as a transition area between the outdoors and the interior. It helps to reduce drafts and maintain temperature by acting as a buffer zone. Vestibules are commonly found in residential homes, commercial buildings, and places of worship. In architecture, vestibules can vary in size and design, but they typically include a door leading outside and another door leading into the main area. They may also feature windows, seating, or decorative elements, enhancing both functionality and aesthetics in structures like churches and museums.