Vanguard S&P Small-Cap 600 ETF (VIOO)

The Vanguard S&P Small-Cap 600 ETF is an exchange-traded fund that seeks to track the performance of the S&P SmallCap 600 Index, which measures the performance of small-cap companies in the United States. The fund is managed by Vanguard, one of the largest investment management companies in the world.

The fund's portfolio is comprised of small-cap companies that are selected based on market capitalization, liquidity, and other factors.

Small-cap companies may offer investors the potential for higher returns compared to larger, more established companies, but may also carry higher risks. Small-cap companies may be less established, less diversified, and more vulnerable to economic downturns and market volatility.

The expense ratio for the VIOO ETF is 0.10%, which is relatively low compared to the expense ratios of some other small-cap funds. This may make the VIOO ETF an attractive option for investors seeking exposure to small-cap companies at a low cost.

Overall, the Vanguard S&P Small-Cap 600 ETF may be a suitable investment for investors seeking exposure to small-cap companies in the US equity market.