1. An index fund follows a defined index
The fund aims to replicate or closely track the holdings and weights of a benchmark such as a broad-market index.
Tip: The fund’s job is tracking, not stock-picking.
2. It gives diversified exposure through one product
A broad index can hold many companies, reducing individual company concentration compared with buying a few stocks.
Tip: Index diversification depends on what the index actually contains.
3. Tracking is never perfectly free
Expense ratio, trading costs, cash holdings and operational effects create tracking difference between the fund and the index.
Tip: Compare tracking difference as well as expense ratio.
4. An index can still fall sharply
Passive does not mean safe. If the market index falls, the fund will generally fall too.
Note: Indexing removes manager-selection risk, not market risk.
5. Quick check
A broad equity index falls 20%. What should you expect from a fund tracking it?
Answer: B - The index fund is designed to track the index, including its declines.