Exchange-traded funds (ETFs) are hugely popular with investors. One of the most recognized names in the ETF space is Vanguard, the company behind several of the biggest funds in the world in terms of assets under management.

It has several huge ETFs to fit any investing style, including those that seek to replicate the return of the S 500. The Vanguard S 500 ETF (NYSEMKT: VOO) holds $1.1 trillion of assets, for example. There's an even bigger fund that in practice accomplishes the same goal. The Vanguard Total Stock Market Fund (NYSEMKT: VTI) is, like VOO, an index ETF that's popular because of the diversification it provides at an unbeatable price.

Let's look at the fund that many investors use when they want exposure to the wider U.S. stock market and three things investors need to know about this wildly popular ETF.

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Source Fool.com