A Global Index is a measurement tool that tracks the performance of a specific set of assets, such as stocks, bonds, or commodities, across different countries. It provides investors with a way to gauge market trends and economic health on a worldwide scale. Examples of global indices include the MSCI World Index and the FTSE All-World Index. These indices are often used by fund managers and investors to create diversified portfolios. By comparing the performance of various markets, a global index helps in making informed investment decisions and understanding the overall market dynamics.