The movie "Nightmare Before Christmas" is indeed a claymation, also known as stop-motion animation. The film features intricate models and puppets crafted from clay, wire, and other materials, which are then painstakingly animated frame by frame to create the movie's distinctive look. The production of "Nightmare Before Christmas" involved a team of animators, designers, and technicians who brought the film's dark and whimsical world to life in vivid detail. The claymation style adds a layer of tactile charm and handmade quality to the movie's unique visual aesthetic.