Windows are openings in a building's walls that allow light and air to enter while providing views to the outside. They can be made from various materials, such as glass and wood, and come in different styles, including casement, sliding, and double-hung. Windows play a crucial role in energy efficiency and aesthetics. Facades refer to the exterior faces of a building, often designed to be visually appealing. They can incorporate various materials, such as brick, stone, or metal, and may include decorative elements. The facade not only contributes to a building's overall appearance but also affects its performance in terms of insulation and weather resistance.