In easy words, means that you will have the same amount of money as revenue than the one you will spend as cost. Hence, no losing money, but no making money either
It is only good in terms of that you don´t loose, and it allows you to have the company running, maybe penetrating new markets, etc. (e.g., some market entry exercises that are strategic can be very good with an NPV = 0)
Usually, you would look for positive NPVs to ensure profitability
Hope it helps!