This is a great seven-minute video from PBSoffbook on Youtube.
The mini-documentary explains how the gif format emerged in the 1980s and has endured to make a comeback in recent years. Countless websites use animated gif images and they provide a creative alternative to still illustrations.
However, I particularly like the concept of capturing quiet but memorable snippets as memories, such as with the example in the film of the couple hailing a taxi (where were they off to???).