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Index/Indices
An Index is a basket of stocks that is used to track and measure the performance of a specific market, market sector, asset class, etc.
The most popular index is the Standard and Poor's 500, commonly referred to as the S&P 500.
While you can't trade an index (indices plural) directly you can trade a mutual fund or ETF that tracks the index. Popular ETFs that track the S&P 500 are SPY and VOO.