"Fermented milk" is a fermented dairy product, which is characterized by containing a large number of beneficial microorganisms such as lactic acid bacteria, which is very helpful to human health. Lactic acid bacteria is an important probiotic, which can form "intestinal microecology" in the intestine, and has a positive effect on promoting food digestion, enhancing immunity and inhibiting harmful microorganisms.

Fermented milk is a dairy product with a long history. As early as ancient times, people began to use fermentation technology. In different countries and regions, the varieties and fermentation methods of fermented milk are also different. For example, in Japan, people like to drink yogurt and yogurt. In Europe, there are many classic yogurt and yogurt varieties, such as Greek yogurt and fromage.

With the increasing demand of modern people for a healthy diet, fermented milk is becoming more and more popular. There are many different brands of fermented dairy products in the market, such as functional drinks containing probiotics and prebiotics, professional brands for different groups of people and so on. At the same time, various DIY methods of making fermented milk have attracted more and more attention and become a popular healthy lifestyle.