In classical mathematics, analytic geometry, also known as coordinate geometry or Cartesian geometry, is the study of geometry using a coordinate system.
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.
A vector graphics editor is a computer program that allows users to compose and edit vector graphics images interactively on a computer and save them in one of many popular vector graphics formats, such as EPS, PDF, WMF, SVG, or VML.
In computing, a window is a graphical control element.
A window manager is system software that controls the placement and appearance of windows within a windowing system in a graphical user interface.
In computer graphics, z-buffering, also known as depth buffering, is the management of image depth coordinates in 3D graphics, usually done in hardware, sometimes in software.
z-index is a CSS property that sets the stack order of specific elements.