ETF (Exchange-Traded Fund)

An ETF is a basket of securities that trades on an exchange like a single stock, giving instant diversification.

Common mix-ups

An ETF is not the same as a mutual fund; ETFs trade intraday and usually cost less.

Picture this

A beginner with $500 buys one share of a broad-market ETF and instantly owns a slice of hundreds of companies across every sector and geography. A friend with the same $500 buys five individual stocks, one of which falls 30% on an earnings miss — that single holding drags the whole account. The ETF holder cannot pick a winner, but also cannot be sunk by a single loser. This is the core trade-off of the ETF structure: you give up the thrill of concentrated bets for the safety of the whole market.

How to apply it

Match the ETF to the job: broad index funds for core exposure, sector or thematic ETFs only for satellite bets you understand. Compare expense ratios and tracking error, not just the name on the tin.

What it means for you

It lets one purchase own hundreds of stocks at a low cost.

A quick example

Key takeaway

The ETF’s genius is diversification in a single ticker at a rock-bottom fee. One purchase can own hundreds of stocks, trade intraday like a share, and cost a fraction of an active fund. Match the ETF to the job — broad index funds for the core, narrow themes only as satellites you understand — and compare fees and tracking error, not just the name. For most investors, a handful of broad ETFs is a complete portfolio.

Definitions reviewed by the Investing Glossary editorial team.