A
well designed animation will come onto the screen quickly and
enhance your site visitors' impression of your products or services.
An animation might simply
give the "feel" of your product or service or actually
show how something works.
You might
want the animation to run for a couple of times and then turn
off, or run seemingly randomly or maybe when you visitor triggers
it.
Something
moving on the monitor will make your site sparkle with life
and visually break the monotony of the web, encouraging your
visitors to stay on your site longer and learn more.