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Each ETF represents a certain index. So the ETF for the S&P 500 trades under the ticker SPY. The ETF for the DJIA trades under the ticker DIA. And the ETF for the Nasdaq 100 trades under the ticker QQQ. You've probably heard of the QQQ. It is a great trading or investment vehicle. When you buy shares of the QQQ, you are getting exposure to Apple, Netflix, Google, Amazon, Facebook, and many other tech (and some non-tech) stocks. If you buy the QQQ and hold it for the long-term, you will be able to profit from the long-term growth of the tech industry.
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Matthew R. Kratter (A Beginner's Guide to the Stock Market)