ETFs are usually managed by fund management companies, and fund assets are a basket of stocks. The types of stocks in the portfolio are the same as those in a specific index (such as SSE 50 Index), and the proportion of stocks is the same as that of the constituent stocks of the index. Fund management companies can make adjustments and changes according to the situation.

ETF is a fund that tracks the changes of the "underlying index" and is listed and traded on the stock exchange. Investors can buy and sell the ETF of the "underlying index" as simply as buying and selling stocks, and they can get basically the same rate of return as the index.