Simulators can produce all sorts of numbers, but the numbers themselves aren't terribly meaningful until they are put into context by visualization techniques. For example, the coordinates of the various atoms in a molecule don't readily convey the shape of the molecule, but once those coordinates are loaded into VMD, the the resulting picture conveys not only the shape of the molecule, but other important properties as well.
Learn more about visualization techniques from the resources on this site, listed below.