Waste or discard pile is the card pile created with cards extracted from stock and not moved to other game elements. Waste shows top card, uncovered, and a little number besides, indicating the number of cards in the waste. If empty, shows a card shadow.
Only the top card is available for playing. To move the card to other game element drag and drop until the target element.
In some games without Foundations (for instance Golf type games), waste is used to discard, following some sequence rule, cards from other game elements. In this cases game is ended when all cards are moved to waste.