Windows can make your basement more visually pleasing and improve safety. Large basement windows, sometimes called "egress windows," from Pella of Sheridan are made to allow more light into underground rooms than the older, smaller, rectangular windows that are put above ground. They also provide a way to get out in case of an emergency.
The primary differentiator between basement, or egress, windows and standard windows is that basement windows are required to be big enough for an average-sized person to escape through in order to meet safety requirements set up in building codes. You are able to select from appropriately sized casement, sliding or double-hung windows when you add basement windows. Be sure you completely understand local building codes prior to purchasing basement windows.