Passive fund (usually called index fund): Generally, a specific index component stock is selected as the investment object, instead of actively seeking the performance beyond the market, it tries to copy the performance of the index.
Generally speaking, active funds are suitable for one-time purchase, but buying active funds tests investors' ability to choose funds. Passive funds are suitable for long-term fixed investment, because there is little difference in the performance of passive funds and the requirements for fund managers are not high.