Catalysts for performance lie ahead.When you think of investing, you might immediately think of buying individual stocks. If you choose quality companies and hold on for the long term, that's a fantastic way to grow wealth. But you don't have to stop there. Here's a complementary strategy you can use to boost your portfolio: Investing in a fund that tracks the companies driving today's economy. The Vanguard S&P 500 ETF (VOO 0.32%), which replicates the performance of the S&P 500, is one of these funds.Inves ...