2, the concept of Introduction:
Index Fund (Index Fund), as the name suggests, is a specific index (such as the CSI 300 Index, S&P 500 Index, Nasdaq 100 Index, Nikkei 225 Index, etc.) as the underlying index, and the index's constituents as the object of investment, through the purchase of all or part of the index's constituents to build a portfolio to A fund product that tracks the performance of an underlying index by purchasing all or a portion of the index's constituent stocks. In general, index funds aim to minimize tracking error so that the trend of the portfolio moves in line with the underlying index in order to achieve roughly the same rate of return as the underlying index.
For investors to buy index funds there can be two channels: one is through their account bank, stock account of the over-the-counter fund subscription or fund companies and other websites to buy index funds; the second is through the stock account in the secondary market to buy index funds. The former refers to over-the-counter funds and the latter refers to over-the-counter funds, which are limited to the purchase of index funds listed on the exchange such as index LOF and ETF.