Each player's cards which have been destroyed, discarded or used make up their own discard pile.
This is where all discarded cards go. Your discard pile is always face up, and either player can look at it whenever he or she likes.
The face-up, overlapped row of cards in the middle of the table to which players place their discard, or from which players may optionally draw.
Also known as deadwood. A pile of discarded cards, usually those, folded or discarded by players.
The pile of cards you've discarded. These cards are always face-up. Anyone can look at these cards at any time.
Played Actions, destroyed Things and discarded cards end up in the discard pile, which is placed face-up in view of all Players. Anyone may dig through it at any time.