The three most widely followed US stock indexes—S&P 500, Dow and Nasdaq—are tracked by many ETFs and mutual funds.

The S&P 500 represents approximately 80% of the US stock market. It is a market cap weighted index of 500 leading US companies. Microsoft (MSFT - Free Report) , Apple (AAPL - Free Report) and Amazon (AMZN - Free Report) are its top holdings.

The Dow Jones Industrial Average is a price-weighted measure of 30 US blue-chip companies selected by the editors of the Wall Street Journal.

Boeing (BA - Free Report) and Home Depot (HD - Free Report) are its top holdings. Google-Alphabet (GOOGL - Free Report) and Amazon (AMZN - Free Report) are not included in the index because their prices are too high and they will change the index too much.

Nasdaq 100 is a large-cap growth index. It holds 100 largest non-financial companies listed on the Nasdaq exchange. Microsoft, Apple, Amazon, Facebook and Alphabet are its top holdings.

To learn more about the Vanguard S&P 500 ETF (VOO), SPDR Dow Jones Industrial Average ETF (DIA) and Invesco QQQ (QQQ), please watch the short video above.

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Zacks Names "Single Best Pick to Double"

From thousands of stocks, 5 Zacks experts each have chosen their favorite to skyrocket +100% or more in months to come. From those 5, Director of Research Sheraz Mian hand-picks one to have the most explosive upside of all.

It’s a little-known chemical company that’s up 65% over last year, yet still dirt cheap. With unrelenting demand, soaring 2022 earnings estimates, and $1.5 billion for repurchasing shares, retail investors could jump in at any time.

This company could rival or surpass other recent Zacks’ Stocks Set to Double like Boston Beer Company which shot up +143.0% in little more than 9 months and NVIDIA which boomed +175.9% in one year.

Free: See Our Top Stock and 4 Runners Up >>