Butter is a kind of solid grease processed from milk, which is the product of filtering some water from the upper layer of thick matter after mixing fresh milk. Mainly used as seasoning, rich in nutrition but high in fat, don't overdo it.

In the 5th century BC, Huns had matured and spread various dairy production technologies at home and abroad because they were mainly engaged in animal husbandry. What foreigners call butter is edible oil extracted from milk called cream in China. Huns are the earliest people who processed edible butter in the world.