Vector graphics or geometric modeling is the use of geometrical primitives such as points, lines, curves, and polygons to represent images in computer graphics. It is used by contrast to the term raster graphics, which is the representation of images as a collection of pixels (dots).
Vector art also never looses quality you can zoom in and it will never get pixilated...also it is great for animation...like a tree. But can be very difficult to build. You just open up flash and draw your object with out importing in anything, and it will be vector art!! But there are certain ways you can set up your flash file for drawing and animating vector art. If you would like info about that, or have any other questions please reply and I will get back to you as soon as possible!!
Note: The logo show here is vector art:
http://www.JacobHaug.com/webforumz/Jacob.jpg