What is the strongest index fund in the past 10 years?

The strongest index fund in the past 10 years is difficult to determine with certainty, as the performance of index funds can vary depending on the specific index they track and market conditions. However, based on historical data and performance records, some index funds have consistently delivered strong returns over the long term. For example, the S&P 500 index fund has been a popular choice among investors due to its diversified portfolio and solid performance over the years. Additionally, index funds tracking other major indices such as the NASDAQ 100 or the Dow Jones Industrial Average have also shown impressive results in the past decade.