Arguably, no two retailers are a bigger part of Americans' everyday lives than Walmart (NYSE: WMT) and (NYSE: TGT). They are the only two national brick-and-mortar multi-category retailers, meaning they're everywhere and they sell everything.

While they compete closely with Costco Wholesale and Amazon, Costco is a membership-based, buy-in-bulk retailer, a much different type of business, and Amazon operates almost entirely online.

In terms of scale, Walmart is far larger than Target, as it has many more stores in the U.S., a thriving international business, and Sam's Club, a direct competitor to Costco. Walmart is also the world's biggest retailer by revenue.

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Source Fool.com