The MSCI World Index is a global stock market index covering stocks of large and mid-cap companies in 23 developed countries. The index is used as a benchmark of equity market performance in the world covering a wide range of sectors, providing a snapshot of stock movements in major economies.

The MSCI World Index is designed and managed by MSCI Inc. a financial services company that provides a range of global market indices. The index includes more than 1,500 stocks from companies in sectors such as technology, healthcare, finance and industrials. Countries represented in the MSCI World Index include the United States, Japan, Germany, the United Kingdom, Canada, and Australia. The index is calculated based on market capitalization, which means companies with larger market capitalizations will have a greater weight in the index. MSCI World is often used by portfolio managers and investors as a tool to track the performance of global equity markets, as well as to make investment decisions based on international diversification.