When you save artwork in a bitmap format—such as JPEG, GIF, or PNG—Illustrator rasterizes all objects at 72 pixels per inch and applies anti-aliasing to them. However, if your artwork contains type, the default anti-aliasing settings may not produce the desired results. Illustrator provides several options specifically for rasterizing type. In order to take advantage of these options, you must rasterize type objects before you save the artwork.