Edible oil, also known as "edible oil", refers to the animal or vegetable oil used in the process of making food, which is liquid at room temperature. Edible oil will be divided into four grades according to the quality from high to low: grade one, grade two, grade three and grade four. Edible vegetable oil has four fears: one is afraid of direct light, the other is afraid of air, the third is afraid of high temperature and the fourth is afraid of water. Therefore, edible oil should be dark, sealed, low temperature and waterproof.