Vector Graphics refers to a style of graphic image data which is a mathematical representation of the image using points, lines, etc - rather than a mapping of how the image would appear (such as a bitmap or raster image).
Since Vector Graphics are not based on pixels, they do not change resolution when they are scaled up or down. Vector Graphics are also always consistent in size, whereas bitmaps and raster images change size depending on scale. The qualities make Vector Graphics a preferred medium for computer generated graphics - but they must be converted to bitmaps or raster images in order to render them on a display, or print them on a printer.
