The image of a paw print on the top is a raster image. A raster image is made up of a fixed number of colored dots or pixels. Even if there image had no dots or “noise”, you still would not be able to make it larger without having it look worse. The image on the bottom is a vector image. Vector images are made up of math formulas and information that, when displayed, are calculated to reproduce exact copies of the original. Another great advantage to vector images is that they can be made larger or smaller without the loss of clarity, sharpness, and detail.
On the Vector Magic site, there are video tutorials along with numerous before and after examples. The price is also right – Free!graphics Raster Vector Website