A raster image is an image made up of a grid of little squares called pixels. Lines and arcs are represented by coloring the appropriate pixels. Raster images can be saved as various sorts of file including BMP, CALS, GIF, IMG, JPEG, PCX, PDF, PNG and TIFF. check my portfolio at - https://www.behance.net/swapniljain1975 Vector art is ideal for printing since the art is made from a series of mathematical curves, it will print very crisply even when resized. For instance, one can print a vector logo on a small sheet of copy paper, and then enlarge the same vector logo to billboard size and keep the same crisp quality. A low-resolution raster graphic would blur or pixelate excessively if it were enlarged from business card size to billboard size. (The precise resolution of a raster graphic necessary for high-quality results depends on the viewing distance; e.g., a billboard may still appear to be of high quality even at low resolution if the viewing distance is great enough.)