You’ve seen casinos in the movies: mob-run joints with tough pit bosses, friendly dealers and attractive waitresses serving drinks. But how does an actual casino operate? Who runs the floor? How do they catch cheaters? How do they make money? How far back do casinos go in history? Check out this article to find out:
http://entertainment.howstuffworks.com/casino.htm
Also in that link is a link to a podcast called “Stuff You Should Know” that goes into how online gambling works