The first category is liquid milk, which mainly includes sterilized milk, sterilized milk, yogurt and so on. The second category is milk powder. Milk powder is a powdered dairy product made of fresh milk with a certain amount of protein, fat, vitamins, minerals and other ingredients, and its moisture is removed. Including whole milk powder, skimmed milk powder, whole milk powder with sugar, flavored milk powder, infant milk powder and other formula milk powder. The third category is condensed milk. Condensed milk is a kind of concentrated milk, which is used to accompany meals, coffee or food ingredients in daily life. Condensed milk contains about 40% sugar, so it is not suitable for long-term consumption as a milk substitute. The fourth category is cheese. Cheese is the essence of milk, and only 1 1 kg milk can produce 1 kg raw cheese, which is a dairy product with high nutritional value.

The fifth category is milk fat. Including thin cream for making cakes, cream for bread, etc. The sixth category is milk ice cream. Milk is made by mixing milk fat, spices, stabilizers, antioxidants, sucrose or a part of vegetable oil and drying. The seventh category is other dairy products. Mainly includes casein, lactose, milk tablets and so on.

Dairy products can also be divided into fresh milk, milk powder, condensed milk, yogurt and cheese according to the usual habits.

Raw milk, also known as fresh milk, is raw milk squeezed directly from cattle. Low-temperature preserved fresh milk usually refers to milk that is pasteurized and homogenized with raw milk, also called pasteurized milk. Pasteurized milk is commonly known as fresh milk without adding stabilizers, thickeners and emulsifiers.

Condensed milk contains more carbohydrates and ascorbic acid than milk powder, while other ingredients such as protein, fat, minerals and vitamin A are less than milk powder. The disadvantage of condensed milk is that if it is not eaten at one time after the iron cover is opened, it is easy to deteriorate and infect bacteria. Milk powder is a powder made by removing water from milk, which is suitable for preservation.

Yogurt is a kind of milk product made of fresh milk, which is sterilized by Markov, then added with beneficial bacteria, fermented, cooled and filled. Yogurt not only retains all the advantages of milk, but also makes full use of its strengths and avoids its weaknesses in some aspects, making it more suitable for human nutrition and health care products.

Cheese is a fermented milk product, and its properties are similar to those of common yogurt, but its concentration is higher than that of yogurt, which is similar to solid food and has richer nutritional value.