Double-Hung windows have two sashes that move up and down independently. Single-Hung windows have a single operable (lower) sash. They do not open outward or extrude from the house.
Picture windows are stationary windows that do not open. They allow a lot of light into your home to brighten up any room. Picture windows also are commonly used in places to maximize the view.
Specialty shaped windows could be a variety of different shapes from half-rounds and arches to triangles and octagons.
Sliding (Gliding) windows slide horizontally which allows for top to bottom ventilation. Similar to Single and Double-Hung windows, they do not open outward or extrude from the house.
Bay & bow windows angle out from the house and are made up of three or more windows. The individual windows can be single or double-hung, casement, or picture windows.
Casement windows have hinges on the side and crank open outward to the left or right.
Awning windows have hinges at the top and open out from the bottom. This allows for ventilation and helps to keep rain out.