Staging is how the scene of an animation is set up so that the audience can understand the storyline. It shows how things such as attitude, mood, reaction or an idea can relate to a story.
Due to limited time within film, this is used to relate the story in small time periods, so it has to be used effectively not to confuse audiences. Limited actions and not cluttering a scene are very beneficial when considering this principle. The background itself also must not draw from the action itself, so the two must work together.
Staging explained. Video courtesy of Accents in Animation.