Definition of animation and stop-motion animation

Animation is the process of creating motion and shape change illusion by means of the rapid display of a sequence of static images that minimally differ from each other. The illusion—as in motion pictures in general—is thought to rely on the phi phenomenon.
http://en.wikipedia.org/wiki/Animation

Stop motion is an animation technique to make a physically manipulated object appear to move on its own. The object is moved in small increments between individually photographed frames, creating the illusion of movement when the series of frames is played as a continuous sequence.
http://en.wikipedia.org/wiki/Stop_motion