Investing basics
An index fund aims to follow a defined index rather than selecting investments through discretionary forecasts. Its result should be judged against that index after costs and implementation differences.
Make it click
Think of a kitchen following a published ingredient list instead of a chef choosing tonight's favourites. The result is meant to resemble the recipe, although substitutions, timing and costs can create small differences.
Now put that into markets
The index supplies the selection and weighting rules. The fund holds all or a representative sample of constituents and rebalances when the index methodology changes.
Index funds can use an ETF or mutual-fund wrapper. Tracking difference shows the gap between fund and index returns, while tracking error describes how variable that gap has been.
Understand what the index includes, excludes and weights. A market-capitalisation index gives larger companies more influence; an equal-weight or factor index answers a different question.
Passive describes how holdings are selected, not an absence of decisions or risk. Index design, reconstitution, costs and concentration still shape the outcome.
Takeaway
