In the spirit of better investing, and in celebration of the first annual Worldwide Invest Better Day (WWIBD) coming up on September 25, Motley Fool analysts will be answering user- and reader-submitted questions leading up to the big event. "Ask a Fool" anything, and we'll do our best to help you invest better.

The Dow Jones Industrial Average is a 30-component grouping of stocks meant to be a gauge for how the overall market is doing. It represents stocks across all sectors and includes some of the world's most influential and established companies, like Bank of America (BAC -1.67%), Wal-Mart (NYSE: WMS) and Procter & Gamble (PG 0.34%). In the following video, Fool.com analyst Austin Smith goes over everything that investors need to know about this index.

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