The real wordsTheory
Open-end funds
Open-end fundA fund where the number of shares issued depends solely on investor demand, bought and sold directly through the investment company rather than on an exchange.
SEBI's version says the same in four lines: no fixed maturity date, continuous sale and re-purchase requests accepted, transactions are NAV-based, and unit capital is not fixed.
That last point is the whole difference from a closed-end fund, and it is why the NAV, not a market price, is the number that matters.