Canasta and RUMMY are two popular card games that involve melding. Canasta is a 7-letter game that requires players to form melds of seven cards, while RUMMY is a 5-letter game that requires players to form melds of three or more cards. Both games involve the use of a standard deck of 52 playing cards, and the goal is to be the first player to reach a certain number of points. Players can score points by forming melds, which are combinations of three or more cards of the same rank, or by discarding all of their cards.