Dairy products refer to foods made from animal milk such as milk, goat's milk and horse's milk. As a nutritious and digestible food, dairy products are very popular all over the world. In the background and significance of the topic, we can analyze it from the following aspects:

1. Nutritional value of dairy products: dairy products are rich in high-quality nutrients such as protein, calcium, phosphorus, zinc, vitamin B2 and vitamin B 12, which are beneficial to human health.

2. The dairy industry chain is complete: from dairy farming, dairy processing to sales, the dairy industry chain covers many links and plays an important role in promoting economic development and solving employment problems.

3. Huge dairy product consumption market: The global dairy product consumption market is huge and has maintained a steady growth trend in recent years. In China, the United States, the European Union and other major countries and regions, the consumption of dairy products has increased year by year.

4. Fierce competition in the dairy industry: The competition in the dairy industry is fierce, and many brands and products are constantly emerging, so consumers have more choices. This also urges enterprises to continuously improve product quality and innovation and enhance their competitiveness.

5. The development of dairy products faces challenges: Under the background of global climate change and ecological protection, how to achieve sustainable development and reduce resource waste and environmental pollution has become an important issue facing the dairy industry.

To sum up, the topic of dairy products has a wide background and great significance, which not only helps to better understand the development of dairy industry, but also helps to promote the healthy and sustainable development of dairy industry.