Historical Rules · 1 October 2009
Rule 400.1
Official source text from the 1 October 2009 Rules release
A zone is a place where objects can be during a game. There are normally six zones: library, hand, battlefield, graveyard, stack, and exile. Some older cards also use the ante zone. Some casual variants use the command zone. (See Section 9, "Casual Variants.") Each player has his or her own library, hand, and graveyard. The other zones are shared by all players.