Stop motion animation involves physically manipulating objects and shooting them one frame at a time to create that sense of motion. It’s a painstaking process and it was among the first to be experimented with and is still used to this day. Nowadays computers can be used to create stop motion animation films, which greatly speeds up the time it takes to produce them. Before computers it was labor intensive work.
There are several types of stop motion animation films. Puppet animation involves puppets moving around in a tightly constructed environment to show size. Claymation is pretty self explanatory in that the characters are made from clay or appear that way and allow for greater manipulation of the characters through the movement of the clay. Gumby is a great example of claymation. If you’ve seen the first episode of South Park (and some subsequent episodes) you know about cutout animation, which seems simple but takes ages.