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Dividend Yield
Hart's answer regarding the difference between an index and a stock aside, remember that dividend yield is a passive measure.  It takes the announced dividend (which is a $/share amount) and divides it by the current market price.   So you can't assume that if you buy a stock that had a dividend yield of 4% for $100 that you're guaranteed 4% of the stock price in dividends.  If the price of the stock doubles, you'd still get $4, but the yield would drop to 2%.  Or the company could reduce (or even suspend) its dividends, which would reduce the yield if the stock price stayed flat. For an index like the S&P, it's easier to measure dividends on % yield terms rather then $/share terms since you'd have to own shares in every single company to get that amount, but on average the stocks in the S&P 500 pay X% in dividends (which are typically quarterly) - some pay more than that, some less, and some none at all.