A client may ask for an animation for several reasons. They may want to demonstrate how a product is used. The internal components may need to be displayed in an exploded sequence for training. The form and materials of a product can be more fully communicated in an animation compared to a still image.
Please have a look at the following projects.
Smilo Baby Bottle Parade: AJ Design Studio Ltd
Smilo Baby Pacifier Parade: AJ Design Studio LTD
Logitech Air Mx rendered in Octane/Lightwave: AJ Design Studio Ltd