Z.1.1- There are 8 zones in Magic. The zones are: Ante, Graveyard, Hand, In Play, Library, Phased Out, Removed from Game, and Stack. [D'Angelo 1999/05/01]
Z.1.2- Each player has their own version of each zone, with the exception of the In Play and Stack zones, which are shared by all players. [CompRules 1999/04/23]
Z.1.3- If a card (or token) moves from one zone to another, it forgets everything about what it was doing and any effects which were upon the card lose track of it. [CompRules 1999/04/23] For example, a card in the graveyard does not know if it was ever in play or if it just got discarded to end up there. Rule Z.7.1 and Rule Z.9.5 outline two exceptions to this rule.
Z.1.4- If more than one card is moved from one zone to another by a single effect, all those cards move simultaneously. If the new zone requires some sort of ordering (as with the Graveyard and Library), the controller of that zone decides in what order to place the cards. [CompRules 1999/04/23]
Z.1.5- If a card or token is sent to the Hand, Graveyard, Library, or Ante zone, it always goes to its owner's version of that zone. [CompRules 1999/04/23]
Z.1.Ruling.1- An ability which triggers on a card (or token) moving from one zone to another can remember information about the card (or token) in the previous zone. [D'Angelo 1998/02/03] See Rule A.4.18.
Z.1.Ruling.2- An ability that triggers on something going from one zone to another is not resolved until after the something gets to its target zone. [D'Angelo 1998/02/03]
Z.1.Ruling.3- An ability which triggers on a card (or token) moving from one zone to another cannot track the card (or token) to a third zone. If the card (or token) is not in the second zone and the ability tries to affect it, it does nothing. [DeLaney 2000/01/22]
Z.1.Ruling.4- If a card in a zone is "put" into that same zone, nothing happens. The card remains where it was and nothing triggers. [Jackson 2000/04/19] For example, if Reanimate is used on a Phyrexian Dreadnought and you sacrifice no creatures, the Dreadnought stays in the graveyard at the same location it was at.