Poker was developed sometime during the early 19th century in the United States. Since those early beginnings, the game has grown to become an extremely popular pastime worldwide.

In the 1937 edition of Foster's Complete Hoyle, R. F. Foster wrote: "the game of poker, as first played in the United States, five cards to each player from a twenty-card pack, is undoubtedly the Persian game of As-Nas." By the 1990s some gaming historians including David Parlett started to challenge the notion that poker is a direct derivative of As-Nas. Developments in the 1970s led to poker becoming far more popular than it was before. Modern tournament play became popular in American casinos after the World Series of Poker began, in 1970.

Now people start to play Online Poker using their smartphones.

Various types of useful software applications are available for online play. Such tools include hand database programs that save, sort, and recall all hand histories played online. Scanning the active tables for known players and displaying previous statistics from hands with those players next to their name(known as a Heads up display or HUD) is a common feature of these programs and is allowed by most sites. Other programs include hand re-players and odds, equity or variance calculators. Some software goes as far as to provide you with quizzes, or scan your previously played hands and flag likely mistakes. 

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