Windows Home Improvement Advisor Windows Windows look simple, but they are actually quite complex. To accomplish all of this, they have many features that work together elegantly.
Different windows function in different ways.
At their simplest, all windows have frames and glass. Most have some kind of weather stripping. Windows used for ventilation may also have screens to keep insects and debris outside. Window frames are made of wood, aluminum, vinyl, or a combination of materials. Wood insulates well but it also weathers, so some windows have wood on the inside and vinyl or aluminum on the outside.