1. Butter is actually a solid oil processed from milk. At first, the fresh milk was stirred until a sticky substance floated on it, and then some water was removed, which is what we call butter. Butter is mainly a condiment in life, which is very nutritious, but it is also high in fat. Don't eat too much.

However, due to the low efficiency and high cost of extracting butter from milk, most of it is margarine now. The cost of margarine has become lower, but it tastes no different from normal butter. As a condiment, butter naturally does not need to be the main nutritional supplement, as long as the taste is similar.