Stock Markets Exposed

When you look at yahoo finance , or nasdaq, or dow, are these called indexes, stock markets or just summaries?

They usually have listings that say something like Whatever company Inc. abbreviated WCI and then it has %up and %down for that day, last trade dividend, etc...and other financial information about the stock , not only that but these things usually show several other stocks as well. Like every stock in existence really that is large cap. Just curious of what the official word for these things is . Like this for example http://finance.yahoo.com/q?s=SBH+

Public Comments

1. these r stockmarket summaries:)
2. Yahoo finance is a portal like many others that provide information on financial markets among other news. Indexes are groupings of stocks based on certain categories. For example DJIA (often referred to as "Dow"), is an average of the 30 largest public companies in the United States. Similarly, the S&P 500 is an index for 500 Large-Cap stocks. http://en.wikipedia.org/wiki/Stock_market_index The Nasdaq and NYSE are stock exchages where stocks are listed.