Most of the animation you see these days is done by computers. It seems that we see fewer and fewer films made with stop-motion animation, a time-consuming art where objects are manipulated and photographed 24 times per second to create the illusion of motion.
One of the greatest works of stop-motion art was 1994's "The Wrong Trousers," by Nick Parks featuring his characters Wallace and Gromit.
Here's a clip of the short film where Gromit, a dog, and Wallace, an inventor, attempt to catch a penguin who stole a diamond. The breathtaking animation in this scene helped the short win the Academy Award for Best Animated Short Film.