Synonyms: Synonyms: Motion
In UI, animation means a slight motion of interface elements, taking place while interacting with the user. Animation is aimed to explain to the user what is going on with the system, how to get from A to B in the interface, and how the website or the app works. Motion is the best to use in navigation, state-changing, page load.
The features of a well-done animation are smoothness, briefness, and unobtrusiveness.