ETF is the abbreviation of exchange traded fund, which is translated into "transactional open index fund" in Chinese, also known as exchange traded fund, and is a kind of index fund. ETF is essentially an open-end fund, which is not essentially different from the existing open-end funds. ETF is a special hybrid fund, which overcomes the shortcomings of closed-end funds and open-end funds and integrates their advantages. ETF can track specific indexes, such as SSE 50 Index; Unlike open-end funds, ETF uses a basket of index stocks to purchase and redeem fund shares; Etfs can be listed and traded on exchanges. Because ETF is easy to understand and highly accepted by the market,