Tapioca is extremely smooth flour, which make for a great thickener in sauces, pies and soups.
Tapioca Flour can sometimes behave similar to cornflour but will become gelatinous at times once cooked. Best to use in combination with other gluten free flours.
Substitution Ratios:
1.5tsp tapioca flour : 1tbsp wheat flour
2tbsp tapioca flour : 1tbsp cornflour