This is a fund index. Index funds generally have the investment goal of closely tracking the underlying index and minimizing the tracking error. They aim to make the change trend of the investment portfolio close to the underlying index in order to obtain roughly the same rate of return as the underlying index.

Index funds are also called passive stock funds.

Passive stock funds are stock funds.

To put it more simply, a fund is a basket of stocks, while an index fund buys or adjusts stocks according to certain algorithmic rules, without human factors.