Milk is a widely consumed dairy product that is secreted by the mammary glands of mammals. Around the world, milk is one of the most common dairy products and is widely used in food, beverages, cooking and more.

Milk is rich in nutrients, including protein, fat, calcium, vitamin D, etc. Among them, protein is one of the main components of milk, containing a variety of essential amino acids, which play an important role in human growth and health maintenance. The fats in milk are mainly saturated fatty acids and trans fatty acids, and although they have some nutritional value, excessive intake can increase the risk of cardiovascular disease. Calcium is essential for maintaining bone health, while vitamin D helps promote calcium absorption and utilization.

In the market, milk is mainly divided into three types: fresh milk, long-lasting milk and dairy products. Fresh milk is freshly milked raw milk that has not been processed. Long-lasting milk is produced on the basis of fresh milk, after high temperature treatment, sterilization, bottling and sealing and other links, with a long shelf life, often used as family spare milk. Dairy products include a variety of dairy products, such as yogurt, cheese, butter, etc., which require processing and additives in the production process.

Milk is widely produced and consumed worldwide, and the main producing countries include the United States, India, Brazil, China, etc. In addition to being used as a beverage, milk is also used in many fields, such as cheese, yogurt, baby food, baking, desserts, etc., so the milk market demand is very wide. With people's attention to healthy food, low-fat milk, organic milk, plant-based milk, etc. have been continuously concerned and promoted.