A stacking window manager (also called floating window manager) is a window manager that draws all windows in a specific order, allowing them to overlap, using a technique called painter's algorithm. All window managers that allow the overlapping of windows but are not compositing window managers are considered stacking window managers, although it is possible that not all use exactly the same methods. Other window managers that are not considered stacking window managers are those that do not allow the overlapping of windows. These are called tiling window managers.