According to google:
"Potato bread is a form of bread in which potato flour or potato replaces a portion of the regular wheat flour. It is cooked in a variety of ways, including baking it on a hot griddle or pan, or in an oven. It may be leavened or unleavened, and may have a variety of other ingredients baked into it."
"What is the difference between potato bread and white bread?
Potato bread contains more iron, potassium, calcium and magnesium than white bread. "