What is the difference between vector and raster graphics?

There are traditionally two different categories that all graphic files can be placed into; vector based graphics and raster based graphics. Each type has its strengths and weaknesses along with limitations of use. Vector based images and graphics are mathematically derived and typically work well with spot color imaging. A vector image can also be blown up to any size with absolutely no distortion. Raster based graphics, also known as pixel-based graphics, are perfect for websites or when trying to show continuous tones or shading. However, because the art is pixel based, large prints or images may show some distortion.