NAV, or net asset value, is the price of one unit of a mutual fund, worked out at the end of each business day.
A fund's NAV per unit is the market value of everything it owns, less what it owes, divided by the number of units issued.
For example, a fund holds shares and bonds worth ₹100 crore, with no liabilities, and has issued 5 crore units. Its NAV is ₹20. If you invest ₹10,000 at that NAV, you receive about 500 units.
A higher NAV does not make a fund expensive. ₹10,000 buys 20 units of a fund at ₹500, or about 667 units of one at ₹15. A 10% rise adds ₹1,000 to either. The NAV level mostly reflects how long a fund has been running and how much it has grown.
Each plan and option of a fund has its own NAV: the Growth and IDCW options differ, for example, because one pays money out.
Each fund page has its returns, risk, costs, managers and everything it holds.