Extrusion technique which is used in food processing is known as food extrusion. It is a procedure by which a number of assorted ingredients are forced through an opening in a holed die or plate with a pattern explicit to the food. Then it is cut to an indicated size with the help of blades. The extruder machine consists of a huge gyrating screw firmly fitted within a fixed barrel; at the end of the barrel is the die. The process of extrusion allows mass manufacturing of food through an endless, well-organized system that guarantees homogeneity of the end product. Food products which are manufactured using this technique typically have very high starch content in them. These food items include many breakfast cereals, some pasta, breads, textured vegetable protein, ready-to-eat snacks, cookie dough, fat soy, confectionery, and certain pet foods, baby foods, and beverages.