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GIF
Abbreviation for Graphics Interchange Format
In short and in plain language
GIF is an older format for pictures with few colours.
It can also show short moving pictures. That is why people often use it for them.
For photos, other formats usually work better.
Definition
GIF is an older image format for graphics with few colours. It can contain short animations and is therefore often used for moving images. Other formats are usually better suited for photos.