The Nasdaq Composite is a stock market index that includes almost all the stocks listed on the Nasdaq stock exchange. It’s one of the most-followed indices in the U.S., along with the Dow Jones Industrial Average and the S&P 500, and is heavily weighted towards technology companies. This means that the performance of tech giants like Apple, Microsoft, and Google has a significant impact on the overall value of the Nasdaq Composite. Investors often use it as a benchmark for the performance of the technology sector and the broader stock market.