Animator

An animator is an artist who creates multiple images, known as frames, that give an illusion of movement called animation when displayed in rapid sequence. Animators can work in a variety of fields including film, television, and video games. Animation is closely related to filmmaking and like filmmaking is extremely labor-intensive, which means that most significant works require 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"). Animated films share some film crew positions with regular live action films, such as director, producer, sound engineer, and editor, but differ radically in that for most of the history of animation, they did not need most of the crew positions seen on a physical set.
In hand-drawn Japanese animation productions, such as in Hayao Miyazaki's films, the key animator handles both layout and key animation. Some animators in Japan such as Mitsuo Iso take full responsibility for their scenes, making them become more than just the key animator.

Source: wikipedia