Modifying existing images is quite difficult.Can place raster or pixel-based images created in photoshop.Graphics can be scaled up or down without loss in resolution.The distance between paths is calculated by an algorithm, so if you scale an image up or down, the quality remains the same. Vector graphics, as opposed to raster-based graphics, use paths instead of dots (or pixels) to represent images. Originally created in 1987, Illustrator is Adobe’s vector graphic software.