Index funds buy etf funds, lof funds do not belong to index funds. Index funds follow a specific index and buy all or part of the constituent stocks in the index, so as to keep the changing trend of this portfolio consistent with the index. etf funds are the on-site forms of index funds.

Lof fund is called listed open-end fund. After the issuance of this fund, investors can buy and sell on the exchange and purchase and redeem in the OTC market.