External trade, or foreign trade, refers to the buying and selling of goods between two countries. It leads to increased sales and profits, improved product quality through advancement in technology, and diversified products and markets. External trade also provides stability in prices, better use of national resources, increased employment, accelerated economic growth, and promotes cooperation among nations. The document goes on to outline the key procedures for exporting goods such as obtaining necessary codes, confirming orders, manufacturing, inspection, customs clearance, and transporting goods via ship. It also provides an overview of important import procedures such as obtaining codes, marketing research, opening letters of credit, customs clearance, and informing importers of goods' arrivals.