Porcine gelatin is the kind of gelatin that is used in Campfire Marshmallows.
The Porcine Gelatin is made from pigs bones that the protein is extracted from which makes the Gelatin.
That is what Gelatin really is.
The Gelatin in Jello, Marshmallows, Gummy Bears etc are derived from animal bones such as pigs, cows etc.
The bones are then boiled to extract the gelatin.
In short terms the gelatin in marshmallows and other things such as Jello is made from collagen, a protein that comes from animals used for food, like beef.
So if you're a vegan and do not want to eat animals then you need to avoid marshmallows, jello, gummy bears and other gummy candy or anything that contains gelatin.