This is a passive ETF managed by Vanguard that tracks the FTSE Emerging Markets Index. It provides market-cap-weighted, automatically diversified exposure to large-, mid-, and small-cap stocks in emerging markets such as China, India, Taiwan, and Brazil. Korea is classified as a developed market under the FTSE methodology and is therefore not included.

It suits asset allocators who want to add emerging-market exposure to a portfolio dominated by developed markets, as well as global core investors who prefer to manage Korea separately through a dedicated ETF.

It is a passive (index-tracking) ETF managed by Vanguard.

The fund uses a passive strategy designed to provide broadly diversified exposure to the large-, mid-, and small-cap stocks of the emerging markets as classified by FTSE. It carries heavy weights in China, India, Taiwan, and Brazil, and the key difference from MSCI-based ETFs is that Korea is classified as a developed market and excluded.

• Broad diversification across emerging markets on an FTSE basis
• Classification system that excludes Korea
• One of the lowest-cost emerging-market ETFs in Vanguard's lineup

Assets under management (AUM) stand at $119.8B, and the expense ratio is 0.06% per year.

As shown in the table, IEMG and EEM track MSCI emerging-market indexes and therefore include Korea. AVEM is actively managed, and EMXC is a variant that excludes China, so their exposure structures differ. On cost, VWO, IEMG, and SPEM are the cheaper direct substitutes.

Because it is affected by emerging-market currency, political, and policy risks, its volatility tends to be higher than that of developed-market ETFs, and short-term volatility has widened during periods of rising US interest rates and a strong dollar.

It belongs to the group of mega-sized emerging-market ETFs that attract diversified asset-allocation flows seeking emerging-market growth exposure. Inflows can be especially pronounced during phases of dollar weakness or strong momentum in China and India.

Its main strengths are an ultra-low expense ratio and broad emerging-market diversification. The drawbacks to consider in advance are the exclusion of Korea, the concentration in China, and emerging-market policy risk.

As shown in the table, IEMG and EEM are direct substitutes that track MSCI emerging-market indexes, with the difference that they include Korea. SPEM is a broad emerging-market variant in the SPDR lineup, AVEM is an actively managed variant, and EMXC is a variant that excludes China. For additional Korea exposure, consider EWY. For single-country exposure to India, consider INDA, and for emerging-market bond exposure, a variant such as EMB can also be reviewed.

Here are the points to review before investing in VWO. Broad emerging-market diversification is its strength, but it is advisable to double-check China's weight, the exclusion of Korea, and emerging-market policy risk before buying, and to review your position size and complementary ETF combinations as well.

Emerging-market currency, political, and capital-control risks, together with the concentration in China and the exclusion of Korea, are the main drivers of short-term volatility and diversification limits. In cycles of rising US interest rates and a strong dollar, short-term losses can be larger than those of developed-market ETFs, so it is worth reviewing your position size and complementary ETF combinations together.

It is regarded as a standard choice for a core holding with broad emerging-market diversification. If you want Korea included, IEMG and EEM are suitable variants. If you need to remove China, EMXC fits, for single-country Korea exposure, EWY, and for emerging-market bond exposure, EMB.