What is potato flour?

Question

I am trying a Polish recipe and it calls for potato flour. What specifically can that be?

Answer 1

...and now you know!  To duplicate it in a recipe, as a thickener...use some instant potato flakes.

Answer 2

A type of flour produced from cooked, dried, and ground potatoes. It is used as an ingredient in potato based recipes to enhance the potato flavor and is often mixed with other types of flour for baking breads and rolls. It is also used as a thickener for soups, gravies, and sauces. Potato flour is often confused with potato starch, but potato flour is produced from the entire dehydrated potato whereas potato starch is produced from the starch only