1. Raw flour is a term that often appears in recipes, and it is mostly used for thickening. The raw flour used in Chinese mainland is potato flour, the raw flour used in Hong Kong is corn flour, and the raw flour used in Taiwan Province is Taibai, made of potatoes or cassava.

2. Starch is the polymerization of glucose molecules and the most common storage form of carbohydrates in cells. Starch, also known as starch in catering industry, can be extracted from starch-containing substances such as corn, sweet potato, wild acorn and kudzu root.

3. Gluten is the starch used to thicken when cooking, and it is also directly called starch or bean flour. There are potato starch, mung bean starch, wheat starch, water chestnut powder, lotus root starch and so on.

Flour is a kind of powder ground from wheat. According to the content of protein in flour, it can be divided into high gluten flour, medium gluten flour, low gluten flour and gluten-free flour.