Gin rummy

Gin rummy is a two-player card game in which players form sets and runs, reducing unmatched cards to score by knocking or going gin.

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Meld (card games): A group of cards arranged as a valid set or sequence under a game's rules. Sets and runs are the melds gin rummy players build to reduce unmatched cards.
Playing card: A printed card from a deck used to play games, commonly bearing a suit and rank. Gin rummy uses a standard deck's ranks and suits to build sets and runs.
Rummy: A family of card games in which players form combinations and seek to dispose of cards. Gin rummy is a rummy variant distinguished by its two-player play and knock-based endings.
Elwood T. Baker: An American player credited with developing gin rummy with his son in the early twentieth century. Baker is commonly credited with creating the game that became gin rummy.
Deadwood (card games): Unmatched cards that do not belong to valid melds in a card game. Deadwood totals determine whether a player may knock and shape the hand's score.
Set (card games): A card combination of the same rank, such as three queens. Sets are one of the two valid meld forms in gin rummy.
Straight gin: A gin rummy variant in which players cannot knock and must reach gin to end a hand. It removes ordinary knocking, making gin the only way to end a hand early.
Conquian: A nineteenth-century melding card game from Mexico, regarded as an ancestor of modern rummy games. Conquian belongs to the older melding tradition from which rummy and gin rummy developed.
Knock (gin rummy): Ending a gin rummy hand with a low deadwood total, allowing the opponent to lay off cards. Knocking ends a hand before gin and gives the opponent a chance to reduce deadwood.
Run (card games): A sequence of consecutive ranks in the same suit, such as the four, five, and six of hearts. Runs are the other valid meld form and can contain more than three cards.