Canasta is a card game resembling Rummy that is played with two decks of cards and four players. It is a popular game in many countries, including the United States, and is often played for money. The objective of the game is to form melds of seven cards of the same rank and then lay them down on the table. Players can also add cards to existing melds on the table. The first player to reach a predetermined number of points wins the game.