The billionaire has proven his investing strengths over time.

Billionaire investor Warren Buffett is known for his engaging stories about investing, and he's quick to throw in a quip here and there that will get a chuckle out of the crowd. But investors take his investing advice very seriously. That's because this investing giant, as chairman of Berkshire Hathaway , has delivered market-beating returns for nearly six decades.

Throughout his investing career, Buffett has pointed out and invested in great companies -- from Apple to Coca-Cola -- but he's also spoken of another complementary investment that is an ideal addition to just about any portfolio. Buffett has even held shares in it, and in one of his shareholder letters several years ago, recommended it to all investors. This

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