In Chinese, a trader is a profession that makes profits by buying and selling the difference. A trader can refer to a businessman or dealer. As a trader, a trader is a general trading institution or individual and can be the trustee of a trading institution. It can buy and sell financial products such as stocks and futures. Although foreign exchange traders in banks also use the English word Dealer, Dealer also refers to casino bankers and market makers who play opponents of ordinary traders in financial markets. Generally speaking, a trader is a person who acts as a principal or trades for the other party in a transaction. Place a buy or sell order in the hope of earning a difference (profit). In contrast, a broker is a person or a company that acts as an intermediary to bridge the gap between the buyer and the seller. Excellent traders are the talents that banks, joint-stock companies, listed companies, funds and professional trading companies are most willing to pay a lot of money to recruit, because the level of traders has a great impact on the company's performance. Societe Generale of France and Bahrain Bank of England suffered huge losses because of traders' illegal operations. In many investment banks, trading is the most profitable business. For example, Goldman Sachs transactions account for 60% of total revenue. Traders are divided into day traders and non-day traders. Non-Japanese traders are very similar to domestic stock trading, because the domestic stock is now T+ 1, but there is no restriction on domestic long position, while there is no restriction on foreign long short position (long short position is very vivid, long position means buying first, and short position means selling first); I'm mainly talking about day traders here, because most people in China are not familiar with it. Day traders mainly rely on small fluctuations in a day to obtain spread profits, that is, they accumulate profits through multiple T+0 operations.