Canasta is a classic card game that originated in Uruguay in the 1940s and gained popularity in the United States in the 1950s. It's usually played with two decks of cards and is best suited for four players in partnerships. The game involves creating melds of seven or more cards of the same rank, and the ultimate goal is to score points by forming melds and disposing of cards.

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Here's a basic overview of how to play Canasta:

Setup: Shuffle two standard decks of cards (including jokers), and deal 11 cards to each player. Place the remaining cards face down in the center to form the draw pile, and turn the top card face up next to it to start the discard pile.
Object of the Game: The primary objective is to score points by forming melds, which are sets of at least three cards of the same rank (such as three 7s or three Jacks). Canastas, which are melds of seven or more cards, score extra points.
Turn Sequence:
- Draw: On your turn, you can either draw the top card from the draw pile or take the entire discard pile if you can legally use the top card in a meld.
- Melding: After drawing, you can lay down melds if you have them. You can also add to your own or your partner's melds on the table.
- Disposal: You must end your turn by discarding one card from your hand onto the discard pile.
Special Cards:
- Red 3s: These are bonus cards that cannot be melded but are set aside when drawn. They score points at the end of the game.
- Jokers: Jokers are wild and can be used as substitutes for any card in a meld.
- Black 3s: These are blocking cards and can only be played during the melding phase.
Going Out: When a player has no cards left in their hand after melding or discarding, they can "go out" by melding or discarding their last card. This ends the round.
Scoring: Points are awarded for various actions, including forming melds, going out, and bonuses for red 3s and canastas.
Ending the Game: The game typically ends when one team reaches a predetermined score, often 5,000 points.

Remember, these are just the basic rules of Canasta. There are variations of the game, including different scoring systems and rules for going out. It's always a good idea to clarify any house rules before starting a game. Enjoy playing!