What is an all-world ETF?

An all-world ETF generally targets broad global equity exposure, often including developed markets and (in many products) emerging markets as well.

This can be a simple "one fund" solution for global equities, especially for investors who want diversification without managing multiple regional ETFs.

The details still matter: check whether it includes emerging markets, the weighting method, and whether it includes small caps. Also check the domicile and distribution policy if you're investing outside the U.S., since that can affect taxes and convenience.