A vector object is a mathematical description of a geometric form. Vector paths are defined by points, which are used to create lines and curves, called vectors. Vector objects do not show a degradation in quality when you zoom in or scale them larger or smaller. On the vector object below, notice how smooth the palette’s edges appear even when magnified. In contrast, a bitmap image is made up of a grid of colored dots, or pixels. Images with complex color variations, such as photographs like the one below, are most often bitmap images. When the photograph is viewed at the correct resolution, its pixels fit together like tiles in a mosaic to form the image. While many applications offer tools to edit either vector shapes or bitmap images, Fireworks lets you work with both types of graphics, which you will do in this tutorial. Source.