CAC40 stands for "Cotation Assistée en Continu 40" and is a stock market index that tracks the performance of 40 of the largest and most actively traded companies listed on the Euronext Paris exchange in France. The CAC40 is one of the most widely followed equity indices in Europe and is considered a benchmark for the performance of the French stock market. The index is calculated based on the market capitalization of the companies included in the index, with the level of the index reflecting the aggregate value of these companies. The CAC40 is used as a barometer for the health of the French economy and is widely followed by investors, analysts, and market participants.

The CAC 40, or Cotation Assistée en Continu, is a benchmark French stock market index that represents the 40 largest publicly traded companies on the Euronext Paris. It serves as a key indicator of the French stock market's performance and economic health. The index includes companies from various sectors, such as finance, industry, and services, providing a comprehensive overview of the French business landscape.

Established in 1987, the CAC 40 is weighted by market capitalization and is regularly reviewed to ensure its relevance. Companies listed on the CAC 40 are among the most influential in France and are often considered leaders in their respective industries. Investors and analysts use the CAC 40 as a barometer for the broader market trends, making it a vital tool for decision-making in the financial world. The CAC 40's movements can be influenced by global economic conditions, geopolitical events, and industry-specific factors.