GIF89a
GIF89a is the second major revision of the Graphics Interchange Format (GIF). Released by CompuServe in 1989 as an update to GIF87a, GIF89a added features for animation, transparency, and metadata while preserving backward compatibility with GIF87a files.
Key changes introduced by GIF89a include the Graphics Control Extension (GCE), which enables per-frame delay times
Animation and compatibility: GIF89a frames can reuse a global color table or specify local color tables. Decoders
Legacy: The GIF format’s LZW compression was patented in the United States, which led to licensing considerations