An ETF, or exchange-traded fund, is a type of investment fund that is traded on a stock exchange, like individual stocks. ETFs are designed to track the performance of a particular financial asset, which can include stocks, bonds, currencies, debts, futures contracts, and commodities such as gold bars or Bitcoin.

ETFs are similar to mutual funds, but they are traded on an exchange, which means that their prices can fluctuate throughout the day. This allows investors to buy and sell ETFs at any time during trading hours, rather than at the end of the day like mutual funds.