Tapioca Flour is a grain-free flour made from cassava root. It is a starchy, slightly sweet flour that is a staple for gluten free baking. It's also a good ingredient for thickening soups, sauces, and pie fillings. Tapioca flour, also known as tapioca starch, is a starchy white flour that has a slight sweet flavor to it. Tapioca flour is an alternative to traditional wheat flours and has a variety of uses in baking. The flour is made from the starch extracted from the South American cassava plant. When the roots have fully developed, they are harvested and processed to remove toxins.