What Is an Index Fund?
Index funds have outperformed most actively managed funds over the long term. They are the simplest way to invest in the broad market.
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An index fund passively mirrors a market index like the S&P 500 instead of trying to beat it. Fees are rock-bottom because there is no active stock-picking.
Real-world example: An S&P 500 index fund charges roughly 0.03% per year — that is $3 on a $10,000 investment.
Explore more terms in our comprehensive Financial Glossary with 140+ terms explained in plain English.
Frequently Asked Questions
Why is understanding an Index Fund important for investors?
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Knowing what an Index Fund means helps you make better financial decisions, read investment news with confidence, and avoid common mistakes. Financial literacy is the foundation of successful investing — understanding concepts like an Index Fund puts you ahead of most individual investors.
How does an Index Fund relate to everyday personal finance?
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an Index Fund isn't just Wall Street jargon — it directly impacts how your money grows (or doesn't). Whether you're managing a 401(k), evaluating a savings account, or considering an investment, understanding an Index Fund helps you make choices that align with your financial goals.
Where can I learn more about investing concepts?
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Our Financial Glossary covers 140+ terms across investing, retirement, taxes, credit, crypto, and budgeting — all explained in plain English with real-world examples. You can also use our calculators to see these concepts in action with your own numbers.