A pork pie is a kind of food that people make by putting some chopped up pieces of pig meat (which is also called pork) inside a crust made out of dough, which is like playdough but you're not supposed to eat it until it has been baked in the oven.
The crust is like a little house around the meat, which keeps all the juices inside and makes it really tasty. Sometimes there are also other things added inside the pie, like herbs and spices to make it more yummy.
Once the pie is all put together, it goes into the oven to bake for a while until it is cooked all the way through. After it's done baking, people can enjoy the pork pie as a tasty snack or meal.