What an ETF Actually Is

An exchange-traded fund (ETF) is a fund that holds a collection of assets — stocks, bonds, commodities, or a mix — and issues shares that trade on an exchange throughout the day, the same way an individual stock does. That combination (fund diversification, stock-like trading) is the whole appeal, but each half has its own mechanics worth understanding separately.

The "fund" half: what you actually own

Buying a share of an ETF does not give you direct ownership of the underlying stocks or bonds — it gives you a share of the fund, which in turn holds those assets. The fund follows a stated strategy (most commonly, tracking an index — a defined, rules-based list of assets) and its manager buys or sells holdings to keep the fund aligned with that strategy.

The "exchange-traded" half: why this differs from a traditional mutual fund

A traditional mutual fund is priced once per day, after markets close, based on the value of its holdings at that moment (its "net asset value," or NAV). An ETF instead trades continuously during market hours at a price set by supply and demand on the exchange — which raises an obvious question: what keeps that trading price from drifting away from what the fund actually holds? That mechanism — called the creation/redemption process — is the subject of the next lesson.

Index funds vs. actively managed ETFs

Most ETFs are index funds — they mechanically track a defined index rather than having a manager pick individual holdings. A smaller category of ETFs are actively managed, where a manager makes discretionary buy/sell decisions, similar to a traditional actively managed mutual fund, just wrapped in the ETF's trading structure. This distinction matters far more for fees and expected behavior than most marketing material emphasizes — covered in the fees lesson.

Next: How an ETF's Price Stays Tied to Its Holdings.