Cinemagraphs are still photographs in which a minor and repeated movement occurs. Cinemagraphs, which are published in either animated GIF format or as video, can give the illusion that the viewer is watching a video.
They are commonly produced by taking a series of photographs or a video recording, and, using image editing software, compositing the photographs or the video frames into a seamless loop of sequential frames. This is done such that motion in part of the subject between exposures (for example, a person’s dangling leg) is perceived as a repeating or continued motion, in contrast with the stillness of the rest of the image.
Here some samples I made a while ago;