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An animator is an artist who creates multiple images called frames and Key frames that form an illusion of movement called animation when rapidly displayed. Animators can work in a variety of fields including film, television, video games, and the internet. Usually, an animation piece requires the collaboration of several animators. The methods of creating the images or frames for an animation piece depends on the animators' artistic styles and their field.
Other artists who contribute to animated cartoons, but who are not animators, include layout artists (who design the backgrounds, lighting, and camera angles), storyboard artists (who draw panels of the action from the script), and background artists (who paint the "scenery"). Moreover, voice actors, musicians and other talent may be added as necessary to give the animation additional depth.

Among the specialized categorizations of animators are character animators (artists who specialize in character movement, dialogue, acting, etc.) and special effects animators (who animate anything that is not a character; most commonly vehicles, machinery, and natural phenomena such as rain, snow, and water).

http://en.wikipedia.org/wiki/Animator