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From a site called "Digital Production": What do the terms 'animatics' and 'slugging' mean?

Animatics and slugging are classically terms used in the preproduction process of storyboarding.

Animatics are moving storyboards allowing the production teams to see what certain shots will look like before deciding to shoot them. Animatics are made after the soundtrack is created, but before full animation begins. An animatic typically consists of pictures of the storyboard synchronized with the soundtrack. Editing the film at the animatic stage prevents the animation of scenes that would be edited out of the film.

This process is very essential in 2D and 3D animated movies as traditional animation is a very expensive and time-consuming process, creating scenes that will eventually be edited out of the completed cartoon is strictly avoided.