Passive index funds are all or most of the constituent stocks that track the index, with high transparency and positions, and less interference from human factors, so the error of such index funds is relatively small.

Most of the assets of the active index fund will track the index, but the fund manager will choose to invest in optimistic stocks or sectors to improve the income, so it is greatly influenced by the fund manager.

Passive index funds have fewer human interference factors, and management fees and custody fees will be less; Active index funds, run by fund managers, have higher management fees and custody fees.