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There are roughly five million online gamblers worldwide. See more casino pictures.

2008 HowStuffWorks

The first online gambling Web site opened 10 years ago, paving the way for the hundreds that exist now on the Internet. A review by the Australian government in 2001 estimated the number of online gamblers worldwide at just fewer than five million, with more than $11 billion spent in online casinos[ref].

But does online gambling differ from casino gambling, and what's the appeal of playing at home by yourself instead of in a casino? In this article, we'll see what it's like to gamble online, find out how you pay to play, and discuss the legality of gambling via the Internet.