An animated GIF (Graphics Interchange Format) file is a graphic image
on a Web page that moves - for example, a twirling icon or a banner with
a hand that waves or letters that magically get larger. In particular,
an animated GIF is a file in the Graphics Interchange Format specified
as GIF89a that contains within the single file a set of images that are
presented in a specified order. An animated GIF can loop endlessly (and
it appears as though your document never finishes arriving) or it can
present one or a few sequences and then stop the animation. Animated GIFs
are frequently used in Web ad banners.
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