What is it called on the internet when the picture is moving

The moving pictures on the internet that move and have little subtitles at the bottom are called gifs

It is called GIF in the internet when the picture is moving.
GIF stands for Graphical Interchange Format. The GIF is a bitmap image format that has come into widespread usage on the World Wide Web (WWW) due to its wide support and portability. The format supports up to 8 bits /pixel for each image . It was introduced by CompuServe in 1987. 

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