Animation triggers play the animataion after specyfic user interaction.
Animation triggers

Hover
It plays animation when the mouse cursor hovers over the object.

Click
It plays animation when user clicks on the object.

Loop
Autoplay the animation as a perfect loop infinitely, with no user interaction.

Loop on hover
It plays animation on loop whenever cursor hovers over the object. After moving the cursor away, the animation stops.

Morph
Hover the icon to play the animation. After moving the cursor away, the animation plays in reverse.

Boomerang
Hover the icon to play the animation from the first to the last frame and immediately reverse.