Exchange Traded Fund (ETF)

An ETF, short for exchange traded fund, is a basket of assets — stocks, bonds, commodities, or a mix — that is packaged into a single security you can buy or sell on an exchange, just like a share of a company. Instead of picking individual stocks, you buy one ticker that represents a slice of everything inside the basket.

Most ETFs are built to track something: an index like the S&P 500, a sector like semiconductors, a commodity like gold, or a bond category. The fund holds (or approximates) the underlying assets, and the ETF's price moves along with the value of that basket. A mechanism involving large institutional traders, called authorized participants, helps keep the ETF's market price close to the actual value of what it holds, by creating or redeeming shares when the two drift apart.

The nuance beginners miss is that owning an ETF share is not the same as owning the underlying stocks or bonds directly. You own a claim on the fund itself, which in turn holds those assets. This matters for things like voting rights, tax treatment, and the fact that an ETF can, in unusual conditions, trade at a price slightly above or below the true value of its holdings — a gap known as premium or discount to net asset value.

The other key difference from a mutual fund is timing: mutual funds are priced once a day after the market closes, while ETFs trade continuously during market hours at whatever price buyers and sellers agree on in that moment, with a bid and ask like any stock.