The Vanguard S&P 500 ETF (VOO) is an index fund that tracks the S&P 500: America's chief stock-market index, made up of publicly traded stocks representing 500 of the largest U.S.-listed companies.

The Vanguard S&P 500 ETF is a powerful long-term investment. However, as it becomes more heavily weighted in tech stocks, it's also more volatile. There's an alternative investment that can still ...