Animation is the technique of creating the illusion of movement from still images shown in rapid succession, exploiting persistence of vision. It grew from Emile Reynaud's Théâtre Optique and Emile Cohl's early cartoons through Winsor McCay's performed drawings, the Disney studio system, television, Japanese anime, and today's computer-generated imagery. The word covers many techniques - cel painting, cut-out, stop-motion, sand, puppet, and CGI - and every visual style imaginable, which makes it a medium rather than a single style: a way of making pictures move, on which particular looks (Disney's rounded naturalism, UPA's flat design, Ghibli's hand-drawn detail) are then built.
Lead image of the Wikipedia article "Animation".Public domain (credit: Branko at English Wikipedia) · source
Defining characteristics
Illusion of movement built from still images shown in rapid sequence
Frame-rate conventions and 'animating on twos' shape the rhythm of motion
Squash, stretch, smears, and anticipation make movement read as alive
Each technique - cel, cut-out, stop-motion, CGI - leaves a distinct surface texture