An ETF is a wrapper, not a promise of safety

An exchange-traded fund pools money from investors and uses it to buy a portfolio of assets. Each share represents part ownership of that portfolio. Investors buy and sell the shares on an exchange at market prices.

That structure says something about how the investment works. It does not, on its own, say how risky the holdings are. An ETF may invest in stocks, bonds or other assets, and its objective determines what it owns.

Many ETFs hold investments across companies and industries. Others are less diverse, and some can even track a single stock. The SEC cautions that ETFs carry risk and that an investor can lose some or all of the money invested if the underlying securities decline.

There is another distinction inside the category: some ETFs follow an index, while others are actively managed. An index fund seeks approximately the return of a chosen index before fees. An actively managed fund follows an investment objective and relies on decisions made by its adviser.

The price on the exchange also need not equal the portfolio's net asset value per share. ETF shares can trade above that value, at a premium, or below it, at a discount. The market price is what matters when an investor actually buys or sells.

Before judging an ETF, read its prospectus and recent shareholder report. Look at its objective, holdings, costs and risks rather than relying on the label alone. This article concerns the SEC-registered ETFs described in the source, not every product traded on an exchange. It is education, not personal investment advice.