Bitmap images are just like a TV picture, in which every little point in a larger raster is mapped with a color. The resolution of the image is according to the size of the raster and is usually measured in dpi, dots per inch. The usual screen resolution is 72 ppi and most web graphics are geared towards that resolution. Higher resolution only increases the file size and does not increase the quality of the picture. Lately there are some screens that display 96 ppi, we can export at that resolution without increasing the file size significantly. The fixed raster causes problems when sizing the image, especially when zooming in. It is like looking at the TV screen through a magnifying glass. Vector vs. Raster (Bitmap) Graphics http://www.flashkit.com/tutorials/Getting_Started/Vector_G-Jessamin-14/index.php A tour of the Macromedia Fireworks MX 2004 http://www.macromedia.com/software/fireworks/productinfo/features/ Source. Looking for vector maps of Germany (Deutschland Vektorkarten) for Adobe Illustrator?."