wwatsonh said:vector drawing: Images produced with a drawing package made up of lines, shapes and co-ordinates.
Vector graphics or geometric modeling is the use of geometrical primitives such as points, lines, curves, and polygons to represent images in computer graphics. It is used by contrast to the term raster graphics, which is the representation of images as a collection of pixels (dots).
The human eye works as a bitmap picture: it catches the image in a mosaic raster of photon recipient nerves, a pixel image. But the brain—according to recent studies—handles it as a vector image. Perhaps because — like in computers— this is easier to store. It explains why humans can recognize simple drawings like cartoons with just outlines because this is so close to what the human brain makes of the visual world anyway. It also serves as an explanation for the fact that logos and signs with easy and geometric shapes are more easily remembered and recognized