Money doesn't jump into your pocket. You usually have to work for it. Once you have some money, though, you can make it work for you. That's the key to generating passive income.

Some ways of making passive income only work well for a relatively short period. Others are more suitable for the long term. Do you want decades of passive income? Here's an exchange-traded fund (ETF) to buy and hold forever.

Vanguard manages several ETFs that should appeal to income investors. I think the Vanguard Utilities ETF (NYSEMKT: VPU) especially stands out. As its name indicates, the fund focuses on utility stocks.

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Source Fool.com