Korean Composite Stock Price Indexes (KOSPI) is the benchmark stock market index of South Korea, representing the weighted average of the largest and major publicly traded companies on the Seoul Stock Exchange. It is the most popular index for measuring and reporting market performance in South Korea and represents the five economic sectors of the nation's wide-ranging economy.

KOSPI is a market capitalization-weighted index and its value is determined from the sum of the current prices of all of the listed shares multiplied by the number of shares outstanding. It was introduced on April 12, 1983 and its base value is set to 1,000. It has since risen to over 2,000 points, making it one of the most successful stock indices in Asia.

KOSPI includes stocks from all of the five economic sectors in South Korea and tracks the movement of the domestic stock market. KOSPI acts as an important indicator of the overall health of the economy and how investment in stocks can reflect the overall performance of the economy. It was also used to help promote foreign investment in South Korea.

By tracking the movement of the KOSPI, investors can gain an insight into the changing trends of the market and the performance of the various listed stocks. The index also plays an important role in providing information to investors about the overall stock market performance. For example, by analyzing KOSPI’s performance, investors can determine if the market is in an upswing or downtrend and adjust their strategies accordingly.

KOSPI has been a valuable tool in helping South Korea to develop its economy, encouraging foreign investment, monitoring and analyzing stock market performance, and providing investors with information regarding the stock market and the economy. The index is monitored and reported by the Korea Exchange and the index values and calculations are adjusted every fifteen minutes. As such, KOSPI provides investors with a comprehensive and up-to-date overview of the Korean stock market and its associated performance.