AutoCAD is essentially a vector drawing application. However, there are occasions when it would be useful to display raster images as part of your drawing. It would also be useful if you could make basic modifications to images and to be able to scale them. Using such tools, you could use an image to trace some base information. For example, a raster map could be used to draw vector contour lines. You could also use raster images in place of vector symbols to add realism or personality to a drawing. Fortunately, such tools do exist within AutoCAD and although they don't approach the functionality of a dedicated raster image application such as Adobe Photoshop, they are adequate for most purposes.
