Buying and selling is a term used to describe the process of exchanging goods or services for money. TRADE, TRADING, and dealing are all terms used to refer to this activity. TRADE is the act of exchanging goods or services for money, while TRADING is the process of buying and selling goods or services. Dealing is the act of negotiating the terms of a transaction. All three terms refer to the same activity, which is the exchange of goods or services for money.