Animation is the form of art where multiple pictures are put together to form a moving object or setting. Back in the day animation was painted on "cels" and photographed on film later on. In this modern day and era animation is done using Computer Generated Imagery, or CGI. Animation under these rules can be either two-dimensional or three-dimensional. However drawing multiple pictures isn't the only way to animate, since there are other ways like Stop Motion, or taking real life objects and changing them frame-by-frame to create an animated film.