A trading company; a firm that conducts trade, brokerage, imports/exports, or other commercial transactions.
彼は大手商社に就職して、海外担当になった。
He got a job at a major trading company and became responsible for overseas business.
商社は取引先との交渉を通じて商品の輸出を進めた。
The trading company promoted exports of products through negotiations with business partners.
総合商社はさまざまな分野で事業を展開している。
General trading companies operate businesses in various fields.