Buying can be defined as the possessing or acquisition of goods by paying a certain amount of money as price for the goods. Sellers carry their goods to the market to sell and the buyers go to the market with money to exchange for goods they need. In order to exchange money for goods, a price has to be negotiated.
Buying in trading is the act of purchasing an asset in the hope that its value will increase, thus potentially making the trader a profit
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In trading, selling is the act of offloading an asset once it has returned the trader a sufficient profit, or if it has made a loss the trader is willing to take.
Buying and selling are related to both long and short positions.