Loop
Motion that ends exactly where it began, so it can repeat without a visible jump.
See it in Cinemagraph. Paint a mask, pick an animation, then change Loop speed.
In plain words
A loop is motion that repeats for as long as you watch. For a clean loop, the last frame has to match the first, so no jump shows. Waves, spins and pulses loop well because they come back to where they started. A cinemagraph plays a short loop inside a still photo. Saved as a video, a loop can play again and again on a phone or a web page.