What is barter?

As a newcomer to the barter industry, when I first heard this term, I was very confused about this unfamiliar yet familiar term. What is barter?

Barter, as the name suggests, exchanges goods for goods, that is, exchanging products for products. And this is not a high-end word. In the early years, there were special mills in the countryside. During the autumn harvest, farmers would take the wheat to the mill and grind it into flour, and pay part of the flour/wheat to the mill as a fee for using the mill. Master, this is a barter transaction.