The origin of Blackjack is somewhat unclear. Some people believe that Blackjack originated in French casinos in early 1700s where it was known as "vingt-et-un" ("20 and 1").
The game became known as Blackjack because if a player held a Jack of Spades and an Ace of Spades as 1st two cards, player was paid out extra. So with a Jack being a vital card and Spades being black, game was called Blackjack.
This game has been played in United States since 1800's. However, between 1850's and 1910, gambling was legal in United States until Nevada made it a felony to gamble. In 1931, Casino gambling was re-legalized in Nevada where Blackjack became one of main games offered to gamblers.
The objective of Blackjack is get as close to 21 points as possible without going over 21 (bust). While numbered cards are worth their face values, face cards (Jack, Queen and King cards) are worth 10 each and Ace card can be worth either 1 or 11.
The person (player or dealer) whose total card value reaches as close to 21 as possible without exceeding 21 (bust) wins game. A tie (push) results if both player and dealer get equal card values.
The game is played in following steps: