The full name of ETF fund is listed open-end fund, including some technology funds. Science and technology fund refers to the fund that invests in science and technology stocks. These funds are usually open-end funds, but some funds can be bought and sold in the market and some funds can be purchased at any time outside the market.

On-site funds have independent market trends and codes, and investors should buy them on the software of securities companies. ETF funds track an index. Take the Shanghai and Shenzhen 300ETF as an example. If investors buy this fund, the trend of the Shanghai and Shenzhen 300 Index will directly determine the price of ETF funds.

OTC ETF-linked funds refer to funds that can only be purchased and redeemed through banks, WeChat, Alipay and Tian Tian Fund Network. There is only one price of OTC funds every day, which can only be seen around 9 pm.