Index funds have witnessed a remarkable surge in popularity over the past few decades, revolutionizing the investment landscape. These funds offer investors an opportunity to passively participate in the performance of an entire market or specific segments, while diversifying risk and potentially enjoying long-term growth. As the demand for index funds continues to grow, so does the number and variety of options available to investors, providing them with a wealth of choices to suit their investment goals and preferences. Explosion in Numbers The number of index funds available to investors has experienced an explosion of growth in recent years. Fund providers and asset managers have recognized the demand for these low-cost, broadly diversified investment vehicles and have expanded their offerings accordingly. From well-established giants like Vanguard, BlackRock, and State Street Global Advisors to a myriad of emerging players, the market now boasts thousands of index funds covering a vast array of asset classes, regions, sectors, and themes. As of 2021 there are an estimated 2,000-5,000 different index funds in the USA. Asset Class Diversity Index funds are no longer limited to traditional equity indices like