An all-in-one ETF is a single fund which offers investors an avenue to build a diversified global portfolio through a mix of bonds and stocks without the need for buying individual ETFs. All-in-one ETFs, also known as asset allocation ETFs, make investing simple and more efficient for common investors to achieve their financial goals. In addition to their simple structure, all-in-one ETFs are designed for automatic rebalancing to keep portfolios on track to achieve their performance target.