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Overview of Online Poker

Traditional (or "brick and mortar", B&M, live) venues for playing poker, such as casinos and poker rooms, may be intimidating for novice players and are often located in geographically disparate locations. Also, brick and mortar casinos are reluctant to promote poker because it is difficult for them to profit from it. Though the rake, or time charge, of traditional casinos is often high, the opportunity costs of running a poker room are even higher. Brick and mortar casinos often make much more money by removing poker rooms and adding more slot machines.

Online venues, like those at PartyPoker.com, by contrast, are dramatically cheaper because they have much smaller overhead costs. For example, adding another table does not take up valuable space like it would for a brick and mortar casino. Online poker rooms also allow the players to play for low stakes stakes (as low as 1¢) and often offer poker freeroll tournaments (like the Rookie Daily Freerolls), attracting beginners. .

Online venues may be more vulnerable to certain types of fraud, especially collusion between players. However, they have collusion detection abilities that do not exist in brick and mortar casinos. For example, online poker room security employees can look at the hand history of the cards previously played by any player on the site, making patterns of behavior easier to detect than in a casino where colluding players can simply fold their hands without anyone ever knowing the strength of their holding. Online poker rooms also check players' IP addresses in order to prevent players at the same household or at known open proxy servers from playing on the same tables.

Free poker online was played as early as the late 1990s in the form of IRC poker. PartyPoker, with both real-money games and free-play games, has been a trusted leader in gaming online since 1997.

The major online poker sites offer varying features to entice new players. One common feature is to offer tournaments called satellites by which the winners gain entry to real-life poker tournaments. In June 2005, PartyGaming, the parent company of the then largest online cardroom, PartyPoker.com, went public on the London Stock Exchange, achieving an initial public offering market value in excess of $8 billion dollars. At the time of the IPO, ninety-two percent of Party Gaming's income came from poker operations.

In early 2006, PartyGaming moved to acquire EmpirePoker.com from Empire Online. Later in the year, bwin, an Austrian based online gambling company, acquired PokerRoom.com. Other poker rooms such as PokerStars that were rumored to be exploring initial public offerings have postponed them.

As of March 2008, there are fewer than forty stand-alone cardrooms and poker networks with detectable levels of traffic. There are however more than 600 independent doorways or 'skins' into the group of network sites. As of January 2009, the majority of online poker traffic occurs on just a few major networks, like PartyPoker.com where players can download poker games for free.

Differences compared with conventional poker