Hand (手札 Tefuda) is the place where player keep the cards drawn from their deck to be used during the game.
Each player has his or her own hand, which cannot be seen by the other player. Generally, player can only play cards from their own hand. Card abilities or effects may also interact with the cards in hand, mostly by using the cards in hand as cost.
Hand has a limit of 6 cards which is checked at the player respective End Phase. If a player has more than 6 card in his or her hand, that player put an amount of cards from his or her hand into Trash until he or she has exactly 6 cards in hand. This 6-cards limit can be modified by card ability like the one possessed by "Administrator Altair".