A purchase or sale, Trade is the voluntary swap of goods and services. Trade is known as commerce or transaction as well. A method that permits trade is called a market.
An independent trader is a person who trades independently. A person who is not employed by a company or an organisation but trades solely by him/her self, mostly else known as self-employed.
A prop trader is someone that is trading someone else's money, "the firm," and typically making commissions on the profitable trades they make. A day trader is someone who buys securities and sells...