Vanguard is a titan in the investment world. Its index funds and exchange-traded funds (ETFs) are easy and inexpensive ways to achieve diversification.

If you're familiar with Vanguard, the first product that comes to mind is probably something like an S&P 500 index fund, its popular growth ETF, or its value ETF.

One of the lesser-known but still massive funds is the Vanguard Mid-Cap ETF (NYSEMKT: VO) with $132.6 billion in net assets. Here's why the fund is unique and worth buying now.

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Source Fool.com