Rummy Action is a card game that involves players discarding cards from their hands in order to form sets and sequences. The goal of the game is to be the first player to get rid of all their cards. The term 'DISCARD' is an action that is taken by players during the game, where they choose to DISCARD one or more cards from their hand. This is done in order to form sets and sequences, as well as to reduce the number of cards in their hand.