2. Open-end fund refers to a fund operation mode in which fund sponsors can sell fund shares or shares to investors at any time according to their needs when setting up a fund, and can redeem the issued fund shares or shares at the request of investors. Investors can buy funds through fund sales agencies, so that the assets and scale of the fund will increase accordingly, or they can sell their fund shares to the fund to recover cash, so that the assets and scale of the fund will decrease accordingly.