Potato Starch is a great gluten free replacement for rusk/breadcrumb, ideal for creating gluten free versions of your favourite burgers and sausages.
It is also widely used as a thickener for sauces and batter, so commonly used by Chinese restaurants.
Starches are used as an additive for food processing - the food starches are often used as a thickener, and improve the texture of foods, and stabilizers in foods products such as processed meat, gravies, pie fillings, puddings, custards, soups, sauces, etc.
Potato Starch is starch derived from potatoes. Frequently used in gluten free baking.