online casino is a place where gamblers play games online . there are two kind of online casinos. one is web based and other is download only . some have the both interfaces. on the web based casinos players play games on web browser . they don"t need to download games . but the other ( download only ) users need to download games on local computers . online casinos buy games various gameing companys like  Microgaming, Playtech and Realtime Gaming etc .on these casinos players can play single player and multiplayer  games . most famous casino games are roulette, blackjack, sic bo, and baccarat .  live casino games are operated by human from casino table . a live casino studio employs one or more cameraman , some croupiers to run the games . some online casinos have special offers like welcome bonus , referral  bonus , no deposit bonus etc . some countries have strict law of online casinos .in the united states online gameing legality vary from state to state . in canada only charitable organization and provincial governments can operate online casinos .