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 1.59%), Wal-Mart (NYSE: WMS) and Procter & Gamble (PG 0.65%). In the following video, Fool.com analyst Austin Smith goes over everything that investors need to know about this index.

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