What is an index fund? | Vanguard
https://investor.vanguard.com/investor-resources-education/understanding-investment-types/what-is-an-index-fund
WEBDefinition of an index fund. An index mutual fund or ETF (exchange-traded fund) tracks the performance of a specific market benchmark —or "index," like the popular S&P 500 Index—as closely as possible. That's why you may hear people refer to indexing as a "passive" investment strategy.
DA: 60 PA: 22 MOZ Rank: 70