Traditional animation is much harder than today's style of animation. It often uses a stop-motion camera to "liven", or animate, the photos made by the producer. When movie-makers use stop-motion, they need to draw one picture for every scene. However, there are tools to help save time with movie-making. Other types of animation, such as limited or digital animation, can also be used now. FPS is the number of times a movie is shot in one second.