Poker is a microcosm of all we admire and disdain about capitalism and democracy. 
It can be rough-hewn or polished, warm or cold, charitable and caring, 
or hard and impersonal, fickle and elusive, 
but ultimately it is fair, and right, and just. 
~Lou Krieger Online Poker Gambling
Poker is a family of card games that
share betting rules and usually (but not always)
hand rankings. Poker games differ in how the
cards are dealt, how hands may be formed,
whether the high or low hand wins the pot in a
showdown (in some games, the pot is split
between the high and low hands), limits on bets
and how many rounds of betting are allowed. In
most modern poker games, the first round of
betting begins with some form of forced bet. The
action then proceeds to the left. Each player in
turn must either match the maximum previous bet
or fold, losing the amount bet so far and all
further interest in the hand. A player who
matches a bet may also raise, increasing the
bet. The betting round ends when all players
have either matched the last bet or folded. If
all but one player fold on any round, the
remaining player collects the pot and may choose
to show or conceal their hand. If more than one
player remains in contention after the final
betting round, the hands are shown and the
winning hand takes the pot.
With the exception of initial forced bets, money is only placed into the pot voluntarily by a player who, at least in theory, rationally believes the bet has positive expected value. Thus, while the outcome of any particular hand is determined mostly by chance, the long-run expectations of the players are determined by their actions chosen based on probability and psychology.
This psychological
aspect is further intensified by the rise of
webcam online poker, in sites such as 888poker and
similar.
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