NPV is the gold standard of investment decision-making. It calculates the total value an investment creates by discounting all future cash flows back to today's dollars and subtracting the initial cost. Positive NPV = the project creates value. Negative NPV = it destroys value. Simple rule: accept positive NPV projects.
Example: A project costs $1 million today and generates $300,000 per year for 5 years. At a 10% discount rate, the NPV is approximately $137,000 — meaning the project creates $137,000 in value above what investors require. The discount rate represents the opportunity cost of capital — what you could earn on alternative investments of similar risk.
NPV considers the time value of money, risk (through the discount rate), and all cash flows over the project's life. It is superior to payback period (ignores TVM), accounting profit (ignores cash timing), and IRR (can give multiple answers). Every major corporation — from Apple to Reliance — uses NPV analysis for capital budgeting decisions worth millions or billions.