How Index Funds Work
Index funds are a type of investment that track a market index by holding a collection of stocks or bonds that represent that index.
It's often said that an index fund and an ETF are the same thing — in fact, an index fund describes how the investments are chosen, while an ETF is one format in which a fund can be offered.
Index funds make investing simpler and often cheaper because they automatically follow the market's overall performance, helping people grow their money without picking individual stocks.
Imagine a basket that holds a little bit of every fruit in a fruit market instead of just one kind; index funds are like that basket but with pieces of many companies instead of just one.
Choosing how to invest often comes down to whether you want to research individual companies or follow a broader slice of the market. Understanding index funds can help you compare options, costs and risks before putting money aside for future goals.
Suppose an index fund follows an index of 100 companies, and the index rules remove one company and add another. The fund adjusts its holdings to match the new list, so a person who keeps holding the fund does not have to place either trade. The fund's value then reflects the updated collection as the companies' prices change.
They follow a set recipe
An index fund uses rules from the index it tracks to decide which investments to hold and how much of each to buy.
They come with different mixes
Some index funds focus on large companies, smaller companies, bonds or markets in other countries, so the mix you choose shapes your risk and potential returns.
Fees can affect your returns
Even small yearly fees can take a bigger bite out of your money over time, so it is useful to compare a fund's costs before investing.