The Dow Jones Industrial Average (DJIA), also known as the Dow 30, is a stock market index that tracks 30 large, publicly-owned blue-chip companies trading on the New York Stock Exchange (NYSE) and Nasdaq. The DJIA was created by Charles Henry Dow in 1896 as a way to measure the performance of the American economy. The DJIA is calculated by adding up the prices of all 30 stocks and dividing by a number called the "Dow Divisor." The current Dow Divisor is 0.14602190177185748398400.The DJIA has been used as an indicator of overall stock market performance for over 100 years and is often quoted in news stories about Wall Street. Some people believe that following the movements of the DJIA can give you clues about where stocks are headed in general. However, it's important to remember that investing in individual stocks should only be done after doing your own research into each company's financial stability and prospects.