Yes, ETF allows investors to purchase and redeem continuously (T+0 trading is not supported, and the part bought on the same day can only be sold on the second trading day). The trading commission of ETF is the same as that of ordinary stock trading, and the most special thing of ETF is to deliver a package of shares when redeeming.

ETF fund is a transactional open index fund. It is a fund that tracks and invests in indexes. It combines the advantages of closed-end funds and open-end funds. It can buy and sell ETFs on exchanges, or buy or redeem them from fund companies.