Bay and Bow Windows
Bay windows are built so that they protrude from the wall, this usually allows for a seating area or just some additional space from where you can enjoy the outside views. They are are made up of three windows. The center is a fixed, larger window, with the two outside, "flankers", are operational. They can range in size and can be customized with casement or double hung for ventilation.
Bow windows are similar to bay windows, but have a more curved look compared to the angular design of the bay. Bow windows normally have more windows, 3-5, but since they are more symmetrical, they have that curved appearance.