The buying and selling of goods; trade or commercial transactions (can also refer to illicit trafficking in contexts).
古本の売買はインターネットで盛んだ。
Buying and selling used books is active on the Internet.
その地域では密猟による動物の売買が問題になっている。
In that area, the buying and selling of animals due to poaching is a problem.
売買契約を結ぶ前に条件をよく確認してください。
Please check the terms carefully before concluding a sales contract.