The things that are given from one person to the other are called goods.
Services can also be part of a trade. One person can do a job or work for another, and get something in return in a trade.
Money can be given in return for a service or for a thing. If money is part of the trade, then the person who gives the money is buying, and the person who gets the money is selling.
A place where trading takes place is called a market.
When there is no money involved in the trade, the trade is called barter. If there is money involved in the trade, the trade is called a purchase. In the past people would barter to get what they wanted, instead of buying goods and services.
Economics includes the study of trade.
Trade occurs not just between people, but also between large companies and even countries. Governments sometimes take some of the money or goods involved trade between countries. This is a type of tax called a tariff. Smugglers try to trade without paying tariffs.
Free trade between two countries is when there are small or no tariffs, quotas, or other restrictions on trade.
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