Foreign trade, also known as "foreign trade" or "import and export trade", refers to the exchange of goods and services between a country (region) and another country (region). This trade consists of two parts: import and export. For countries (regions) that import goods or services, it is import; For countries (regions) that ship goods or services, it is export. This began to emerge and develop in slave society and feudal society, and developed more rapidly in capitalist society. Its nature and function are determined by different social systems.Reciprocal trade: A trade in which a seller undertakes to buy goods or services of equal value from a buyerExhibition trade: An international fair or fair held in the country for a period of time to conduct import and export t