What it means
An ETF holds a portfolio (stocks, bonds, commodities) and issues shares that trade on exchanges throughout the day. Most ETFs track an index passively. They offer instant diversification, intraday liquidity and typically low fees.
Why it matters
ETFs have absorbed trillions in assets and reshaped market structure. Index ETFs have made low-cost diversification trivial. Specialized ETFs (sector, factor, leveraged) have democratized strategies once limited to institutions.
How to use it
Watch expense ratio and tracking error. Avoid most leveraged ETFs for long-term holding (decay). Favor large, liquid funds (SPY, QQQ, VTI) over tiny niche funds where bid-ask spreads eat returns.
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