Temporary (テンポラリー Tenporarī), as it name suggest, is a temporary place to put a card or ability that is being played. Unlike other zones, this zone does not physically exist on the playing field.
All cards and abilities are put into this zone immediately after being played from anywhere, and after it has been resolved, are put into the intended zone or location afterwards (or simply disappear for abilities). This is especially important when a player need to perform the reload effect in the middle of the resolution of an Event, so that the Event does not get mixed up with the cards in Trash when the player rebuild the deck.
Cards that was put from Temporary into any other zone is still considered to be put into that zone from the zone before it was put into Temporary.