An information platform for trading certain information and articles needs a fixed place, called an exchange. Exchange, with the help of information platform, realizes property rights information sharing, off-site transactions, unified coordination and balance of property rights trading market and various terms. A market where securities or commodities are traded in bulk can buy and sell spot and futures. Usually divided into stock exchanges and commodity exchanges. A stock exchange that deals in stocks and corporate bonds is called a stock exchange; Commodity exchanges are called commodity exchanges, trading commodities (such as cotton, wheat, iron ore, crude oil, etc. ).