The S&P 500 Vanguard ETF or VOO is a fund that invests in stocks of some of the biggest companies within the United States of America. It is an exchange-traded fund that tracks the S&P 500 index by taking ownership of all the equities within the S&P. It is one of the most popular and reputed index funds. The S&P 500 is known to be a gauge of the overall United States stock market. The S&P 500 Vanguard ETF aims at tracking the returns of the S&P 500 index. It is well-diversified and comprises equities of large corporations. The fund also employs an indexing investment approach, which is designed in order to track the performance of the Standard & Poor's 500 Index. It is a widely recognized benchmark of the United States. stock market performance that is dominated by the stocks of the largest U.S. companies. The fund matches the target index by investing all of its assets in the stocks that make up the index, which is holding each stock in approximately the same proportion as its weighting in the index.;