What to know about stock market indices?
A stock index is a measure of performance (price changes) in a specific financial market. It tracks the ups and downs of a chosen group of stocks or other assets. Observing the performance of a stock index provides a quick way to see the health of the stock market, guides financial companies in creating index funds and exchange-traded funds, and helps you evaluate the performance of your investments. Stock indices exist for all aspects of financial markets.
