Casement windows are an easy-to-open window, often with hinges on the side. The hinge makes it easy to open the window to allow fresh air in. Casement windows are made of a variety of materials, such as wood, vinyl, aluminum, and fiberglass. The material is usually determined by the location of the window and the desired look. For example, a window in a garage or shed would be made of a sturdy material like wood or vinyl, while a window in a bedroom would be made of a softer material like wood or fiberglass.