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What Is an ETF? A Beginner's Guide for 2026

An exchange-traded fund (ETF) is a basket of investments that trades on a stock exchange like a single share. This guide explains how they work, their growth to a $13.4 trillion industry, and how to decide if they belong in your portfolio.

May 18, 2026
3 min read
Source: etf.com
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Key Numbers

industry size
13.4 trillion

An exchange-traded fund (ETF) is a basket of investments—such as stocks, bonds, or commodities—that trades on a stock exchange like a single share. ETFs combine the diversification of mutual funds with the ease of trading individual stocks. By 2026, the ETF industry has grown to $13.4 trillion, making it one of the most popular investment vehicles worldwide.

How ETFs Work

ETFs hold a collection of underlying assets, such as an S&P 500 index or a technology sector. Shares of the fund are created by the fund provider and traded on exchanges throughout the day at market prices. Investors can buy and sell ETF shares just like regular stocks, through a broker.

Why ETFs Have Grown

  • Low fees: Expense ratios are often lower than mutual funds.
  • Diversification: A single basket provides exposure to many assets.
  • Transparency: Holdings are disclosed daily.
  • Tax efficiency: Their structure typically results in fewer capital gains distributions.

Types of ETFs

  • Index ETFs: Track an index like the S&P 500.
  • Sector ETFs: Focus on a specific sector such as technology or healthcare.
  • Commodity ETFs: Track gold, oil, or other commodities.
  • Bond ETFs: Provide exposure to fixed income.
  • Actively Managed ETFs: Managed by a portfolio manager seeking to outperform the market.

How to Choose an ETF

  1. Define your investment goals: Growth, income, or capital preservation?
  2. Look for low expense ratios: Lower fees mean higher returns.
  3. Check the fund's size and liquidity: Larger funds tend to be more liquid.
  4. Examine the holdings: Ensure they align with your strategy.

What This Means for Investors

ETFs offer a simple, low-cost way to build a diversified portfolio. Whether you are a beginner or an experienced investor, ETFs can be a valuable tool for achieving your financial goals. However, as with any investment, it is important to understand the risks and costs before investing.

Frequently Asked Questions

An ETF (exchange-traded fund) is a basket of investments like stocks or bonds that trades on a stock exchange like a single share.

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This article was rewritten in Wrqti's editorial style based on information from the original source above. Content is informational only — not investment advice.