Arched windows are windows that have a curved top, rather than a flat one. They are typically used to add architectural interest to a building and can be found in a variety of styles, including round, semi-circle, and elliptical. Arched windows can be made from a variety of materials, such as wood, plastic, or metal, and can be fixed or operational (able to be opened and closed). They are often found in older homes but can also be incorporated into more modern designs.