The stock index of financial transactions is Contract for Difference (Contract for Difference), abbreviated as CFD, which is a type of margin transaction. It generally refers to a transaction method that does not involve the exchange of physical commodities or securities, and only uses the difference between the settlement price and the contract price for cash settlement. . After the position is closed, the investor will pay or receive the profit or loss obtained in the transaction. CFD reflects the performance of stocks or indexes, provides the benefits of stock trading without the need to actually own stocks, and allows traders to use leverage in the spot market to conduct transactions in the index and commodity markets without actually purchasing related securities. It is a kind of margin trading. The difference between the buying price and the selling price determines your profit and loss, just like actual stock trading.