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https://en.wikipedia.org/wiki/Stock_market_indexStock market indices may be classified in many ways. A 'world' or 'global' stock market index — such as the MSCI World or the S&P Global 100 — includes stocks from multiple regions. Regions may be defined geographically (e.g., Europe, Asia) or by levels of industrializat
ion or income (e.g., Developed Markets, Frontier Markets).
A 'national' index represents the performance of the stock market of a given nation—and by proxy, reflects investor sentiment on the state of its economy. The most regularly quoted market indices are national indices composed of the stocks of large companies listed on a nation's largest stock exchanges, such as the S&P 500 Index in the United States, the Nikkei 225 in Japan, the NIFTY 50 in India, and the FTSE 100 in the United Kingdom.
Many indices are regional, such as the FTSE Developed Europe Index or the FTSE Developed Asia Pacific Index. Indexes may be based on exchange, such as the NASDAQ-100 or groups of exchanges, such as the Euronext 100 or OMX Nordic 40.
The concept may be extended well beyond an exchange. The Wilshire 5000 Index, the original total market index, includes the stocks of nearly every public company in the United States, including all U.S. stocks traded on the New York Stock Exchange (but not ADRs or limited partnerships), NASDAQ and American Stock Exchange. The FTSE Global Equity Index Series includes over 16,000 companies.[3]
Indices exist that track the performance of specific sectors of the market. Some examples include the Wilshire US REIT Index which tracks more than 80 real estate investment trusts and the NASDAQ Biotechnology Index which consists of approximately 200 firms in the biotechnology industry. Other indices may track companies of a certain size, a certain type of management, or more specialized criteria such as in fundamentally based indexes.