To understand and experiment with animation techniques.
Animation is the rapid display of a sequence of images of 2-D or 3-D artwork or model positions in order to create an illusion of movement. It is an optical illusion of motion due to the phenomenon of persistence of vision, and can be created and demonstrated in a number of ways. The most common method of presenting animation is as a motion picture or video program, although several other forms of presenting animation also exist.
--definition from Wikipedia
Walter Lantz, William McCay, Walt Disney, R. Crumb,
--Taylor, Richard. The Encyclopedia of Animation Techniques. Running Press, Philadelphia, 1996. ISBN 1-56138-531-X