Looping
Note: the default '0' loops means endless looping

1.ENDLESS LOOPING ('0'):
Normally animated gifs made for web pages are designed to loop repeatedly. This is because animated gifs have to be small in order not to take a long time to load; thus to get the most out of an animated gif, you have the action repeat itself. If it ran only once, the viewer may miss the action by blinking at that moment!

2.SPECIFIC NUMBER LOOPING:
The only instance where you might want a specific number of loops would be if a second animated gif is delayed (by a long delay), and yoou want the first animated gif to stop at a specific point so that the second appears to start after it stops. Creative situations like that. However: note that implementation of loop counts is not complete in some browsers (like IBrowse 1.12). You are always safest in using the endless looping situation