Battlefield

The battlefield, formerly known as the "in-play zone", and even earlier the player's "territory", is a shared game zone where permanents reside after being put there, usually after being cast (for artifacts, creatures, enchantments, and planeswalkers) or played (for lands). Instants and sorceries can't enter the battlefield; those cards are usually put into an owner's graveyard as the last part of such spells resolving.

Prior to the Magic 2010 rules changes, many cards used phrases such as "when [this] comes into play", CIP, "put [something] into play", and so forth. As a result of the changes, cards that referred to something coming into or leaving play were given errata to refer to the battlefield instead.

Obsolete terminology
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Rulings

 * When an permanent spell is resolves, it is put onto the battlefield as a permanent.
 * When a land is played, it is put onto the battlefield as a permanent.
 * Tokens only exist on the battlefield.