Pigs make use of a digestive system which is called monogastric (mono-gastric) and it is a digestive system
that is also found in humans too....the “mono” means one
while the “gastric” means stomach,,so monogastric means one stomach...
so here you have a simple and well detailed answer to your question..the pig has just one stomach....
you also need to be aware that the digestive system found in a pig is different from that of animals like sheep and cattle,,sheep and catte have their own digestive
system called polygastric or you can call it ruminant digestive system....